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whats the best rodi unit to buy for a 175? does it run all the time, how long can you store water, how much is wasted?

I have a 6 month old 175 tank with sand bottom. Still cannot grow any calcerous algae just green hairy. Water chemistry is all in range, but cant get phosphates below 2.0. because of my well water. Is this causing the problem. I am careful not to overfeed my 4 fish and i do not have a source for...