Plan B asked in PetsFish · 8 years ago

Do mollies, tetras, Bettas and swordtails need a filter and a heater?

Also can ONE of these fish fit in either a 1 or 2 gallon tank?

I would like to put in one of these in this

I dont want to need to put in a heater or filter

Basically I would just like the easiest possible setup

Thanks Guys!

10 Answers

  • 8 years ago
    Favorite Answer

    Yes, all fish in captivity need a filter in order to survive.

    And all the fish you listed are tropical fish, so you need a heater too.

    The reason for a filter is for biological filtration... for nitrogen cycle to convert ammonia produced by fish into less toxic nitrate.

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  • Mir
    Lv 5
    8 years ago

    Absolutely. EVERY tropical fish needs a filter and heater. Bettas could live in one of these (with a filter and heater) and be okay but they still wouldn't be very happy. How about you get a 5 gallon tank or bigger and keep a single betta in that? 1 gallon is really too small for any fish to be happy. If you have a 10 gallon tank (which is still small) you have a few more options. You could keep a small group (like 4 or 5) guppies or maybe swordtails. Or have a few guppies with a betta (but watch for aggression because the betta could confuse a gup with long fins for another of its species and bother it. All the fish you listed could get along together but they would need something more like a 30 gallon tank. For an easy setup the 5-10 gallon with a single betta is the best choice, but you can't have any set up without a filter and heater and have your fish live a long, happy, healthy life. It is also the best if you want a small tank because the other species all like more friends and bettas are generally solitary so that way you can have one fish like you said.

    Here are reasons you need these:

    heater- Bettas and all the other fish are tropical and do best in temperatures around 80 degrees. This helps them function normally and prevent disease by them having a proper and strong immune system. Also, they are just happier in warm water. Happier fish live longer.

    filter- The filter removes chemicals and debris from the water and keeps it clean. It also helps provide oxygen so they can breathe. But the most important reason for the filter is that it builds up "good" nitrifying bacteria that comsume fish waste and leftover food, which produces toxic ammonia. The bacteria convert the ammonia into safer forms which you keep under control by regular water changes. Imagine a bowl or small tank with no filter. The water isn't moving around and there arent enough good bacteria in the gravel or water, so ammonia builds up and poisons the fish. It hurts their gills and it is hard for them to breathe so that is the main reason fish kept in bowls with no filter die early. The natural lifespan of a betta is over 5 years, and goldfish that are often kept in bowls can live over 20 years in a proper environment.

    If you really want something interesting to keep in a one gallon aquarium and don't need a heater or filter for, then the only thing I can think of, which would still be amazing, is Sea Monkeys! aka Brine shrimp, they can live in room temperature unfiltered water as long as you still do regular water changes by sucking out waste every week and replacing with new water. They are cheap and easy to care for and a great conversation piece! :) Good luck with getting an aquarium.

    Source(s): Personal experience with fishkeeping and the knowledge that even a few YEARS is a very short lifespan for fish in bowls or tanks too small. Here is a good article on "cycling" your tank: and here are other suggestions if you want to just have a small tank (5 gallon): or a 10 gallon, which is better:
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  • 8 years ago

    ALL fish need a filter and all those fish also need a heater. None of them would survive very long in that bowl. The smallest tank you can healthily house a fish in is a five gallon and the only fish you could fit in there is a single betta. The others need at least a ten gallon.

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  • 8 years ago

    Ok a Betta can go in there without a filter or a heater !!! A heater and a filter will not fit in there!!!!! You can get a 10 gallon tank and get a heater and a filter and put the other fish you listed in there just remember its an inch of fish per gallon of water do if you get a ten gallon tank you can have @ 10 of those fish or less if a fish can grow up to 5 inches then you know you can only have two of them in a ten gallon tank! Get an air bubbler it makes a big difference especially if you are going to put a lot of fish in the tank sometimes the filter will not generate enough air in the water to substane them! You can also buy one of this 5 gallon tanks that come with everything already ex: tank, light, pump, etc....... All depends on what you really want ! That small glass bowl will only be good for a Betta or a small goldfish but the goldfish will grow out of it also I would go w a tank not a bowl!!!!

    Source(s): Fish breeder
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  • Anonymous
    6 years ago

    bettas don't need heater or filter as long as u change 50% of the water every 3/4 days

    and yes bettas can live in any tank size

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  • 8 years ago

    Well i know a bit about beta fish and tetras,they can fit in a 1 or 2 gallon tank and they dont have to have a filter and heater they live for about 3 or 4 years without.(which is longer than with the filter and heater) and they are more lively

    Source(s): hand on expirence
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  • 8 years ago

    The betta can breath air so oxygenation isnt a major issue. the other ones will most likely die from either water quality or poor oxygenation in a 1 or 2 gallon. As long as your room stays above 72-74 degrees you shouldnt need a heater for a single betta. ONLY put one betta in the bowl. any more will kill each other. you really should have at least a ten gallon tank for anything more than a betta, plus heater, filter, thermometer, light.

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  • jauli
    Lv 4
    3 years ago

    yup yet confirm you placed the heater to the perfect temperature probable around seventy 5 F, and alter the water weekly. yet only empty a million/2 of the tank & upload some stress Coat conditioner after each and each water substitute. purchase a sixteen oz.. bottle at the two petsmart or petco. good success!

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  • Anonymous
    8 years ago

    Yes and no, no no.

    You want an easy, super cheap tank? I'm going to make this easy on you. Get these items.

    Filter: Nothing to change... use for 4 weeks, throw it out, attach a new one. The small is all you need.

    Airpump: Select the AT2K1 pump for $5.67


    Tank: Select the 3.5 gallon for $9.34 or if you are the big spender type, pull out $12.75 for the 4.5 gallon tank.


    Get some food:

    Get some water conditioner:

    If you follow this TO THE LETTER, you will have THE SIMPLEST, THE LEAST EXPENSIVE yet totally respectable aquarium I can think of. All you need to do is add water and a betta. No koi, no goldfish, no swordtail, nothing but one, 1, uno, einer, l'un, หนึ่ง, אחד BETTA FISH, MALE. Your choice of color and tail style.

    Later, you can add gravel and decor to impress friends and relatives!

    Get it?

    Thank you for understanding.

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  • 8 years ago

    You don't need a heater, as long as the water is room temp. And yes, one fish would be able to fit in a fish bowl like that. Add some plants too! The live ones are easy to maintain also. I have a live plant and all you have to do is bury the root in the gravel at the bottom of the bowl. Every time you change the tank, just rub off the slimey-ness! Pull off any dying parts of it also. Don't use any plastic ones, they rip the fins of bettas! Sorry, I got a little off topic! :)

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