BTA night vs day?

[rpkneumann]

Every night my BTA shrivels up then next morning after lights on it’s shows it’s tentacles again.
She ha been doing this for a week now.
Can anybody explain this behavior?

 

[Twoddler]

Mine do the the same, always have, there about 5wks in tank. No idea why just interested to find out, like yourself

 

[James M]

That’s normal for them to do that at night

 

[Jamie228]

I’m curious as well. I have one that does this every night and the one that hosts my clowns sometimes does but rarely.

 

[StlSalt]

Mine close up at night too. During they day they inflate to absorb light, at night they shrink. They are like 98% water so maybe they're just doing a water change, might be it's way to expel waste. Totally normal behavior.

 

[rpkneumann]

Mine close up at night too. During they day they inflate to absorb light, at night they shrink. They are like 98% water so maybe they're just doing a water change, might be it's way to expel waste. Totally normal behavior.

Thank you.
Was amazed about the size difference between day and night.
Good to know its normal.