Cichlid help?

[duanes]

A 37 gal tank is only large enough for dwarf cichlids (as adults), such as Rams or other Apistogramma.
It could also be used as a temporary grow out tank for juvies of larger species.
I consider a 90 gal only large enough for a cichlid that tops out about 9", and in the case of an adult of that size, only one individual..

 

[Gourami Swami]

For the 37 gallon, if you want colorful fish, perhaps some tanganyikan cichlids. A colony of shell dwellers like Ocellaris with a pair of larger fish like A. compressiceps or lelupi etc would be nice. Would have to use crushed coral substrate etc to get the high pH.
For the 90, if you definitely want a severum, EBAs, and a blood parrot, you are almost fully stocked right there. Add some dithers and perhaps a small pleco and you're done, IMO to add a group of geophagus with those fish would be overstocking it.

 

[C. Breeze]

Firemouths rainbows cutteri with aailfin mollies or other cool livebearer in the 37

Though I really like apistos as well

 

[neutrino]

2. In my 90 gallon I know roughly what fish I want, but need to know if the geophagus species is compatible. Ie: teindachneri, balzanii, pellegrini, pearl cichlid, altifrons, ect. I love almost all the geophagus species ..

If you mean compatible with each other, mostly no, due to temperament, size, or differing water needs, especially in a 4 ft. tank. Altifrons are best in a group (or as an adult breeding pair) and get too big for a 4 ft tank. Steindachneri and pelligrini are closely related and unlikely to tolerate each other in the same tank, pearl cichlids would bully most of the others on the list, etc. You'd get a better display and more natural behavior with a group of one of the smaller to medium geo species vs. mix and match geos.

The fish I 100% want to add to this tank is severums, electric blue acaras, and also blood parrots.

All three of these, especially multiples of each, limits which geos would work besides leaving little or no room for them.

 

[C. Breeze]

4’ tank gets full fast.

 

[Deadeye]

You could probably keep a rainbow, hrp, or nanolutae pair in the 37.