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So quick question on this, I had dinos BAD and my clowns got sick, took them out to bring to my lfs, while they were gone, I rearranged rocks to give more swimming room (90 gallon tank) no other fish except neon goby.It's called 'pacing' and it's typically common with fish that are new to a system and/or fish that are experiencing stress. I wouldn't be too worried about it. If they keep doing it for a very long time then just keep checking your levels and make sure nothing in the tank is picking on them....but some fish just like to do it.
I got one yesterday and have never experienced this behavior before lol its so oddMy clowns did the same thing. Back and forth up and down. Took a few days for them to settle in and claim their little corner of the tank. Literally for three days they swam at the top back and forth.

