That's a lot of stuff for a 40! I think you will have problems with all those pistol shrimp in your tank. I believe they are territorial so you may have problems there. Same thing with gobies. Unless you know how to sex them, you might just end up with a whole lot of dead fish. 8 fish in a 40 is really pushing your luck IMO.
So, you have 2x250GPH powerheads and 2x300GPH return pumps? Did I read that right? Just need some clarification.
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32"x32"x20" Cube-ish tank
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