What's in the tank? Neon tetra, some sort of shark that will probably reach a foot, looks like a pair of Bala? A dwarf gourami, what's the last thing? Looks like a single tail goldfish to me, which will also reach over a foot if it makes it. None of these fish are compatible, minus the gourami and tetra, which both need tanks with dense cover. They aren't cave fish like cichlids, they need full cover. They won't use a cave for comfort, it's simply unnatural for them to do so.
Whoever built this tank doesn't know a lot about fish.
I am a sucker for a good themed tank but this just doesn't seem well thought out.
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