11-17-2012, 12:28 PM
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If it is your intention to spawn the rams and raise the fry (or have them survive), I would not have the pleco. At night most any catfish (which are nocturnal or semi-nocturnal) will easily eat the eggs or the fry.
Dwarf loaches need a group of course, say 5 minimum, which would work. To my knowledge they are not active at night, but even so they are pretty good at exploring every nook and cranny and might still manage to get the eggs/fry, so just bear that in mind.
You will also need a group of upper-water fish to keep the rams settled, what we term dither fish. On their own, all dwarf cichlids can be very shy, but having other fish swimming around with and above them tends to settle them. But here you are getting into space issues, in a 20g, esp with the loaches. For suitable upper fish, have a look at the smaller characins (pencilfish, hatchetfish, some of the tetras) and rasbora (medium-sized species, like those in Trigonostigma). A group of 6-7 of one of these.