12-08-2012, 10:46 PM
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They may be establishing a heiarchy. However you still only have 3 of them, so I recommend going out and getting 3 more for a total of 6. you might also want to add some cardinal tetras.
a word of advice, it doesn't look like you were considering it, but keep all livebearers out of this tank [different ph]. i also highly recommend adding a pump, because some of your fish like waterflow, this may help the roselines and a bunch of live plants (more than what you have right now) to help simulate natural conditions.
some german blue rams could compliment things too. plus red cherry shrimp on top of your ghost shrimp but those are a little bit more expensive. good luck!