There's a few types that'd go in a 4x2x2, but be mindful that most of what I posted there are in the ballpark of several hundred dollars to several thousand dollars each - there's only really 3 that aren't above that with regularity. Most are also from deeper water and necessarily need cooler systems, tropical is not suitable for them and generally will cause them a very early demise.
Reef Discussion
Pretty much exactly the same way humans do it... mandatory rest stops. Except in this case, for fish they have what're called "rest stations" - effectively corrals where they put the fish temporarily to acclimate to pressure conditions. This is the proper way to do it... though there is a ghetto method just ascending. This leads to infection the majority of the time and will cause the fish to expire pretty quick (hence the assumption that all Anthias are doomed).
Another interesting species, Hemanthias vivanus. Unlike most other Anthias species which are restricted to the Pacific and Indian Oceans, this one is found strictly in the Atlantic, from northern Canada all the way down to Brazil. "Way down" is entirely accurate too, these guys have been found as deep as 600 metres across their range.
Another, with a slightly smaller range (Florida through Antilles and Brazil) and much shallower depth (at a tiny 230 m max) is Pronotogrammus martinicensis (syn. Holanthias martinicensis).
Another, with a slightly smaller range (Florida through Antilles and Brazil) and much shallower depth (at a tiny 230 m max) is Pronotogrammus martinicensis (syn. Holanthias martinicensis).
And another that I somehow totally forgot, the Aurora Anthias (Pseudanthias calloura). It astounds me I forgot it, because daaaaaaaaaaaaaaaaaaamn...
some people think that chinese crested dogs are beautiful :P
