Hello! I have a small 8 gallon tank that is currently home to 9 chili rasboras, many snails, and one mystery fish. When I bought the rasboras back in September, there was a tiny baby fry (smaller than a grain of rice) in the bag with them that I decided to put in the tank. Fast forward to now, and I've started spotting this shy fella near the bottom of my tank.
This mystery fish started off as a very pale pink color but the body has steadily darkened over the past few weeks. The fins are clear but the dorsal fin in particular has a yellow fringe. Total size is around 2-3cm, or a little over an inch.
Behavior-wise, it keeps to the bottom third of the tank and doesn't venture far beyond the central rock and wood decorations in the middle of the tank, and never seems to swim outside of plant cover (the dwarf sag provides plenty of that). It is extremely shy and hides as soon as I get close to the tank, but comes back out if I keep very very still.
My first guess is some type of dwarf cichlid but I have no experience keeping them. Provided this guy doesn't grow large enough to threaten the well-being of the chilis, or doesn't grow so big that I'd feel bad keeping it in an 8 gallon tank, I'm happy to leave it as a part of the tank. Hit me with your best guesses.