although that changes in a loach only tank and with higher numbers of them.
I think that as long as they're the biggest fish in the tank, they dominate it. At least mine always did as I never kept much bigger than them fish. But I think they do like dithers, as long as the dithers are lively and energetic...otherwise they'd be spooked by the loaches and the loaches by the dithers. I added the odd 1 baby loach several times over the years to get my "new clown loach fix" and they swam with whatever dithers I had for at the time, whether platies, or the denison barbs and SAEs.....to the point you'd think that they don't know they're a clown loach.
My small loaches tend to avoid the large older ones for quite a while, until they pack some size....Then they start behaving like the older loaches. Takes about 1.5 years to get to a 4 incher....For 6 years, my largest of that group is about 9 inch, the smallest 6 year old could be as small as 5.5-6 inches and I think he's the only male from that batch...
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