09-18-2011, 02:42 PM
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I would put the clown loaches and the silver dollars in the 120. You should be able to put an oscar in there as well.. no guarentees though. A larger pleco should be fine in there as well.
You could get away with a pair of jack dempsey in your 55, however this would not leave room for the inevitable fry so you would have to come up with something to deal with them. Nothing else would likely work with those guys.
As to the 29g, you should be ok with about 12 tetras. A word of caution though, I have heard stories of rams not getting along with cories. Bristlenose Pleco or other smaller pleco perhaps.
Of course this all depends on your water parameters, what is your PH and hardness?
Too much filtration is not necassarily a good thing. Many fish will be stressed with too much current.
Sand is probably not a good idea with cichlids, maybe doable in the 29g. Not sure if rams are diggers like most cichlids.