12-17-2010, 08:22 AM
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IMHO any of the smaller species of pleco (Bristlenose, Pit Bull, Rubber Lip, etc) are still too large for a 10 gl tank.
As far as shrimp, no matter the temperament of the betta, they can and will eat shrimp, if the shrimp(s) are able to fit into their mouths.
I once tried to house my peaceful, way mellow betta with RCS. I placed an order for 25 shrimp, added them to the tank and sat back to enjoy watching the little shrimp get to work. Instead what I watched was my betta dust off 20 shrimp within an hour. They are skilled hunters when they want to be. It was amazing to watch, as he would move ever slow slowly until he was within striking range and then "BAM!", unsuspecting shrimp gone. So much for my idea of keeping my betta with shrimp.
I kept this same Betta in a tank with Otos, no problem, but like I said, he was a VERY peaceful betta. He almost never even flared. (Man, I miss that fish) I think Otos can do well with bettas but Otos require pristine water conditions and many of them can be so picky about their diet they end up starving to death. Starving otos are very common, unfortunately. My otos will never touch algae wafers, but they will munch on spinach leaves.
Does your betta not bother with your Mystery snail? If he leaves the snail alone maybe you can try one of the larger type shrimp? I agree with small fry on the pygmy cories, as they have a tendency to shoal around in the mid level water strata and that would most likely "bother" your betta. Even my mellow betta probably would have been disturbed by the activity level of pygmys.
Good luck with your decision.