Please help me

[Kyle0226]

I'm at my end and losing my mind I have a 65 gallon tank and my nitraits are really high the fish seem fine but it's still high. In the last week I did a 50 percent water change I replaced all the sponges in my canister filter I even added two live plants and have used the tetra ph booster and clarifier but it's not getting any lower do I have too many fish.
I have 6 mollies
3 killifish
2 glo danio
1 giant danio
1 raphel catfish
2 glo tetra
1 suncat fish
2 rainbow sharks they breed
1 flag fish

The fish I have don't get too big so I don't understand why my nitraits are so high if I have too many fish I don't mind giving some away but I don't think so please help me thank you

 

[Kyle0226]

Is it possible that I killed the good bacteria by cleaning my tank too much and my filter could that be why my nitraits are high

 

[Aiken Drum]

What are your water parameters? pH, ammonia, nitrite, nitrate?

Why are you using a pH booster?

Why are you concerned if your fish are OK?

Cleaning your filter too much and replacing sponges can kill off bacteria and crash your cycle, but high nitrate isnt a sign of a crashed cycle. Safe nitrate levels are pretty high. Typically you want to keep them below 40ppm, but fish can acclaimate to much higher levels.