Water change in progress for the South American catfish tank, full of corydoras and ancistrus and hypancistrus
They’re mostly either nocturnal or very very shy, and their eyes are sensitive to the infrared focussing light that iPhone cameras put out - tl;dr, they’re really difficult to photograph and just hide in the caves at the back

…which is a shame, because there’s some baby Hypancistrus in there who are tiny miniatures of their parents and very cute*.

* for a given value of cute. These are fish that look like they were designed by HP Lovecraft while on an LSD bender.