Clown loaches grow so slowly, you might not notice too much growth, but add to that the facts that this one is in a small tank AND all alone (which does stress clown loaches), he's probably not growing or just growing very slowly because he is not thriving. The boesemani is acting like a jerk because he doesn't have any rainbow babes to show off to, or any rival males to try and show-up. Get a group of six or more in a tank that is 55 gallons or more, and you'll see the rainbows keeping themselves so busy, they don't bother with any of the other fish. I've got 18 rainbows, three different species, some as big as 4 inches, and they have never attacked my neon tetras, zebra danios, or lyretail killifish that are in the same tank. I'm not going to judge because the store that sold you these fish probably said they would be fine in your tank (they rarely will tell you that a fish gets too big for your tank), but take what everyone here is saying about the fish you stock seriously because they're giving you good advice that comes from a lot of experience. And definitely do some research on these fish, just keep in mind that maximum fish sizes are often gross underestimates, but rarely overestimates. You will find lots of sites that estimate the max size of boesemanis at 3 inches, sometimes smaller. Very few estimate the max size to be 6 inches, yet this is the true max size for this fish. Same goes for tank recommendations, the larger recommendations will be the more accurate ones.
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