My tank has an awful nitrates problem...
I have a 29gal tank with 6 female betta in it.
My nitrates were threw the roof at one point and I did an almost 100% water change, gravel vacc's the heck out of the tank and even added some live plants to eat up some of the nitrates.
The nitrates are much better but not as low as I'd like them...they are about 25-30ppm (Should be under 20?)
Is there any scavenger fish that can help me with this, that also gets along with female bettas(they are very peaceful)?