daney90
Aquarium Advice FINatic
Bonjour!, I have a CPR90 that I am currently using in my tank but right now my nitrates is around 40 ppm and I want to bring it down to atleast 20ppm or 10 would be better. My tank has been running for about 2 months now and since then I haven't touched the sponge in the overflow box. Instead of seeing it as a black sponge it has now turned into brownish colour with fish poop and etc.. Any of you guys have/had the same prob? What do I need to do?
Thanks
Thanks