ok so the fermantation unit is done and has been taken off the tank. almost 2 days ago now. it was the hangon design so its imposible for it to be knocked over, i hope! my ph is stable because im using RO water, which comes out of the unit at 7.6-7.8 depending on age of the membrane. i use neutral regulator (powder form) to make it 7.0 The tank itself is stable and i havnt lost any fish, even the cardinals. i test the ph all the time and it doesnt change much. im only trying this because i will soon be getting discus fish and i need to master water control lol. im still confused because i had the co2 unit on a ten gallon with good results, nothing like this!!