What is going on with my Brain

[toobrie]

I have 5 brain corals (Wellsophyllia) and 4 out of the 5 seem to expand normally. One of them however seems to expand to a point where it might explode. It eats well when fed but still expands and becomes round like a ball. At night it returns to its normal shape. Anybody have a clue as to why it might be doing this?

Here are a couple pics of it

At Night:

Once the lights are on:

Here are two other brains of mine that seem to be acting normal (at least what I would consider normal)

 

[acrodave]

i see that all the time. not sure why they do it but they do. sun light makes they do it also.. maybe making more surface area to absorb more light

 

[Cody Ray]

Looks like he needs asprin

 

[scapes]

mine do it to. don't think it's a problem.

 

[InsaneClownFish]

What type of lights are you running?

 

[toobrie]

thanks for the help. My tank has two 175w MH on the sides and in the middle is a 250w.