Who Gives A Fish Forums

the sucker fish looks like an albino chinese algae eater to me.

as for the others, they're a mix of cichlids - there are just so many varieties out there, it's tough to pinpoint the exact ones from just pics.

**** edit - didn't catch that you already mentioned they were cichlids, my bad

You're telling me the ex1200 is already overkill for a 240l tank, so adding another one would indeed be excessive. I mean, what's the point of having that much filtration power in a relatively small tank? If you're experiencing some sort of water quality issue, throwing more filters at the problem ...