it started to shrink today and can’t seem to figure out why- and not sure what to look up. Everything else in the tank seems to be fine.
It was open all day and I had to reach in the tank to grab some debris and when I pulled my hand out- I noticed it closed up. (Didn’t put my hand near it). It took a little while to open but never fully opened and seemed to be shrinking now. I don’t think my hand was dirty or soapy