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Karishma asked in PetsFish · 3 months ago

Help with my betta fish ?

I recently started a betta sorority in a 10 gallon tank. There is a filter and a heater. Recently I noticed my larger betta had been developing brown/black spots on her head and sides, and later had been isolating herself by the heater and  not moving around too much, if she did it was around the heater. A few days ago I noticed a long white stringy substance coming out of her underside and this morning found a similar substance attached to the heater with brown specks in it. Can someone help me understand what might be going on and what I can do? 

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