I think by GM you mean Genetically Modified
😕
Electric blue, neon blue, neon green, platinum (with gold, blue or green head), gold etc are all (natural) color mutations of Mikrogeophagus ramirezi that have been line bred
Some are “healthier” than others but I believe this is more due to the particular breeder rather than the particular color mutation
Note (from Sf profile) wild rams are quite small dwarf cichlids 3.5 - 4.0 cm SL
In shops you will often see rams in the 5.0 - 6.0 cm range, that are also much heavier bodied - I suspect these are selectively outcrossed to larger “cousins” (hybrids), also selected for larger fish within a bloodline ... of course the fastest way to accomplish this is with growth hormones
Choose fish that appear bright and active, watch their respiration rate, look for overal healthy appearance, eg, no missing scales, no white edges/marks to fins (especially the pectoral fins), some splits are fine but should not be extensive (physical damage to fins without underlying disease, heals very rapidly)
Apologies Tim for going down this fish health diversion
😳 😳 😳