I have a 75 gallon that has been running for ~6 months, now doing ~50% weekly WC's, temperature 80*F, 0 ammonia, nitrite, nitrate, pH approx. 7.6. Currently have 5 angelfish (scalare, about 40% grown), small groups of black neon tetras and platys, and a pair of bristlenose plecos.
About 1.5...