So my BTA every now and again it'll close up and get real small, almost looking like a little piece of leather. The thing is it only does it 2 or 3 times a week and then comes out bigger, fuller and more "active" with my clownfish afterwards. Now I know you'll want some info so here is what i can think of.
Water parameters are ok (see photo)
30 gallon tank, 24" Oydessa 4 bulb T5 2 whites, 2 blues, feed it every Wed & Sun night at 5pm, adequate flow
If you need any other information just ask, I'll answer to the best of my knowledge. Thanks in Advance!