H2O column - space use by fish

[treesprite]

I am wondering, do fish change the amount of height of the water column they use depending on the height of the water column? Does a fish who usually stays mid column swim closer to the surface if the water is shallower, or does it restrict itself to maintain a certain distance from the surface? For example, if a fish usually uses the column up to 5" from the surface, will putting it in a tank that is 5" shallower cause the fish to swim close to the surface?  

 

I'm asking due to putting in DSB which takes up a good bit of water column height.

 

Edited June 25, 2020 by treesprite

[KingOfAll_Tyrants]

no idea, but I'm interested too.

[BtmDweller]

Depending on fish types. Most fish swim in relation to the reef. Sticking closer to the rock for food/protection.  Other larger fish such as tangs pick at the rocks and swim in large schools a little above the reef.  Many anthias will be found in the water column feeding.  They are sensitive to lights so certain ones have more difficulties in aquariums. So you may see them hiding. The lyretails that are becoming tank bred are a good option for looking for a fish that will be off the rockwork. 

 

So long answer, but its more so relation to how close they are to the rockwork versus the water column.  In your case closing it down to inches they would likely stay closer to the rock/corals if only a couple inches to the surface.  Depending on fish type though. For example chromis and other fearless fish would move up the column closer to the surface. 

 

Edited July 1, 2020 by BtmDweller