Help tadpos ?

There tadpoles or something like that in my hydroponic system is that bad. Ama change it in 3 days but is that bad for the plants there only like 20 left or less i been taking them out.

Well it certainly isn't ideal ,is it? You have frogs in the grow room. Get some h202 in there it will kill them and rest of the parasites in there.

no there lil things swimming in the water

Sounds to me like you're breeding misquitos.... No way it's tadpoles, unless you put them in there.

well there gone now. They just gone now. But now the flies are going all over my plants any fix for it ?

Use natural pesticides like those made of neem oil, they will not harm your plants.