My baby turtle wont grow much? Whats wrong?

They eat crickets, chicken, guppies, pellets, ect everytime I give it to them I had them for 9 months already and only 3 grew about a inch and the rest won't its it because of their tiny tank or what I'm getting frustrated every pet or plant I try to take care of never grows. Do they need lamps I keep them... show more They eat crickets, chicken, guppies, pellets, ect everytime I give it to them I had them for 9 months already and only 3 grew about a inch and the rest won't its it because of their tiny tank or what I'm getting frustrated every pet or plant I try to take care of never grows. Do they need lamps I keep them out in a plastic container in the sun and they swim out there will a basking place make them grow please help!
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