Sleeping Chromis swept away

[Logzor]

I just picked up 3 Chromis, two of which are very small.

They stayed in their trio all day. At night I found that two were kind floating around the tank without really guiding themselves. One even got stuck on a powerhead.

I had the lights on in the living room so I put a blanket over the front of the tank and that seemed to help.

This morning the two ones that were acting strange look fine.

Is there too much flow for these little fish or will they adjust? Perhaps it was because I had the TV and a light on and they schedule was throw out of whack?

In my 55 I have a Koralia 4, 3, and 3.

 

[Logzor]

Now one is missing. Have not seen it all morning and there is no trace of a body or signs that my nassarius snails have devoured a body.

How long will these fish typically hide for?

 

[Logzor]

Has anyone else had problems with chromis going into zombie mode (sleep-swimming) and getting stuck onto their powerheads?

The other night I had to peel a chromis off my koralia and he snapped out of it and swam away, scary!