Clowns swimming fast all over tank..

Take is over 6 years old and these are the only two fish currently in the tank along with a lot of inverts in the live coral.
 
One of the Clowns died this morning...the one that really wasn't eating ...other one still ok. The one that died ate day after he was in my tank once.
 
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.
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.

My lfs cared for them and they sat in a qt tank for 2 weeks, like 10 gallons I'm guessing, a liberal guess.. and my lfs said they were eating just fine. I took them home and put them in the tank, again they've been in the tank for 3 months prior to me taking them out and now they're pacing around the tank constantly. They ate it first but now they're just sucking in some food and spitting it back out. Is this to be expected? I do have pretty high nitrates as I'm trying to fend off dinos, 30ish nitrate and .08 phos last I checked

But I'm worried because the very first time I got them, they didn't act like this. They acted as if they've known me for years. Eating out of my hands directly the same day. My shrimp snails hermit crabs and urchin all seem to be just fine
 
My 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.
I got one yesterday and have never experienced this behavior before lol its so odd
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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