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You can put another membrane than the one you started with. I have had 50,75,100 with restrictor in my Coralvue RODI that came with a 50GPD to start. Works the same unless you have some issue with water pressure.
I have used the stiffer carbon pads to block them from a particular place and hope to catch them on the move. Or if they go on the glass you can get them pretty easy.
I found that when mine split one goes on the move, even if the clowns continue to host them both one still moves. So as soon as mine split it try to find a new home for the one that travels as they always go for the powerheads ... smart they are not.
I like the rock to the far left...I think I would do my best to isolate it more as it is pretty unique. I personally like a little more variation in hight so would move some rock away from the left and build up the right, I like the rock that sticks forward in the left hand side close to the...
I mean you don't have to do exactly 20%. Sounds like your water pressure might be low, you can get a pump to increase pressure and output.....sorry I don't know specifics don't have that problem. With the same 100GPD membrane and a restrictor I usually can fill a 30G brute in half a day or...
Make sure you get and RO/DI filter system ... you need the water to as stripped as possible of nutrients and chlorine and chlorime(sp sorry the new replacement for chlorine) is really bad. And water changes ...more is better always so if you can do 20% better than 10% it all depends on if you...