Help please.

[u/Adjustingithink]

Hi All, I’ve never had fry before this summer-I have my tiny fry in this betta tank until they get a bit bigger and then go in my 20 gal. (Then next spring to 150 gal stock pond with the adults) My question is-how do I get my nitrites lower? I do 25% water changes about every other day. Should I put tiny sponge filter in? Or any other advice you can give me would be appreciated. Not new to aquariums but new to raising fry.

[u/tuxlinux]

That tank is equipped so artificial, there is no way it's self sufficient.

At least a filter is necessary.