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I am personally running 3 maxijet 750s in mine. 2 in opposite corners plus one behind the live rock. I got em for mid 20s each from drfostersmith.com with free shipping
I like koralia because it is a broad softer flow the thing I don't like is when I turn mine off it starts in reverse and I have to turn it off and on again to make it go forward.
I have had 2 Koralia 1050 Evos in my 55g for about 9mo and I love them. I'm probably going to get a 550 or 750 for behind my rockscape to get rid of some very "low-flow" areas.
Im running a 750 in my 36 gal and it has been doing a great job. Just got done ordering a 550 for behind my LR where it isn't getting any circulation. Was a big issue prior to me rearranging today.