FYI
My Chili seems to like relatively low light and low current.
It however very sensitive to debris/algae build up and at times will not open up for long periods, if at all. Mine has stayed closed for months, despite moving it to different positions around tank.
When it does this, if you take it out and go over it with a soft bristled tooth brush, cleaning off any accumulated gunk...It will immediately open up.
Just discovered this...should have thought of long ago...
