fish congregating

This isn't really a problem, just a bit of an oddity. I notice that all 5 of my fish congregate at the bottom right corner of my tank and won't swim anywhere else. It's almost like there is an invisible barrier down the middle of my tank that they won't pass. I wonder why this is...they are different species of fish so I doubt they are schooling. They also fight over one particular cove in the live rock in that corner, even though there are plenty of other coves in other spots. Any ideas why?

 

This can happen for a number of reasons, if the fish are ill, frightened, your water parameters are off, temp, etc.

Can you give some more information on your tank, power heads, flow, water parameters? Someone will be able to help you with that type of information.

 

Maybe they are resting their to escape high flow.

 

You're not standing near that corner are you?

 

I don't just stand in that corner, no

Tank parameters as of last night: ammonia 0, nitrite 0, nitrate 0, phosphate 0, temp 80 F, salinity 1.025.

Flow: one koralia 4 in the top left corner pointed down, one koralia 4 in the mid right pointed up, 1 powerhead in each back corner pointed at each other. The fish congregate in the bottom right of the tank. The flow in the bottom left is low (evidenced by lack of movement of my coral leather in the lower left corner).

 

Sounds ok. Water looks clear and skimmer is pulling? What are the types of fish?

 

Water is mostly clear, although there are always fine whitish particles blowing around due to all the powerheads. The fish: 1 yellowtail damsel, 2 ocellaris clowns, 1 yellow tang, 1 hippo tang, 1 diamond goby (just added last night, and has since disappeared). All but the goby are always hanging out in the bottom right corner.

 

Check the floor around the tank, that's where mine went.

 

Too much light? Heat? prob neither

 

How long has it been setup/what rock was used for setup?
My boss has a 100g setup and ALL the fish in it stayed to the left half of the tank, most of the inverts too. After doing a little digging, I tracked down the cause...A mantis had hitchhiked in and taken up residence in right half...everybody was hiding from him.
I bet a burly gorilla crab could have the same effect.