05-26-2013, 03:03 PM
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Yes on the otos, I've found five works.
Be careful on the loaches, as the two you have are obviously mature. Make sure there are lots of hiding spots, and the best method for this with the smaller (as the new additions will be) is chunks of wood like Malaysian Driftwood. Lots of it. You can find pieces that have tunnels, and this is what you need. I have three loach species in two tanks, and each loach likes to select its home, and if there are insufficient they will fight. But in this case, you have two that are in "their" space, and additions may or may not be appreciated.