he has been doing a water change of 25 percent every couple of days still not getting better, ph 6.8 - 7 and nitrite and ammonia 0 his tank is about 4x1.5x1.5 and his aro is about 1.5 foot long so the tank isnt too small hes in the process of getting a 8x3x3 so what else can he do besides water changes?