The Firemouths are breeding!
They're only coming out one at a time for feeding since the babies were born about three days ago. This one is in the middle of a bunch of thawed brine shrimp.
They've made 3 pits in the back of the tank, and the main one is in behind a log in a particularly densely planted area. You can see one heading back there if you look carefully.
Babies! I captured this by sticking my hand behind the tank and clicking blindly, so please excuse the reflection.