I have not tested the RO
water yet, its next. As for feeding, I feed every other day and sparingly at that. I think I am going to take the sump down and clean it out. Lots of trash on the bottom of it. Will also wash out the rock that is in the sump, make sure I get rid of all the trash in it. I have the rowaphos and after doing more extensive searching, I am understanding thay my phos is a little high. Should be .046 to .012. Mine is .15 to .2. Think Im going to put in the rowaphos and see what happens. Theres no dosing instructions in the rowa'jar' so I'll have to play it by ear with phos kit.