[keymastr]

Nope, RO is a tough one for most of us. You can put a 50 gallon trash can with a shutoff float to make water in if you have a water supply and drain for waste water which you can then pump to the aquarium using a pond pump or sump return pump.

But if I were you I would simply go with the water I had out of the tap unless it contained nitrates. My RO water still contains whatever the water company puts in to keep the PH high so even with pure RO water the PH is 8.2 My fish and plants do not seem to care.

 

[keymastr]

well, normally you would make the RO fill a barrel with a heater and powerhead for mixing and just re-mineralize into that. You will need a pretty strong pump to overcome 8 or 10 foot of head plus the height of the tank from the floor, possibly 14 feet along with the resistance from the hose itself. Not impossible but you need to get it right or water will not get to the tank.

If you want the re-mineralizing to occur automatically you will have big trouble. Unless your tap water is really bad I see no upside to all this and suggest you simply stick with tap and a Python for changes. What you want to do will cost hundreds and may not be any more effective.