What are the water parameters of the tank
if you know any of those.
Also if you have an air stone I would add it because of the increase in temperature reduces available Oxygen for the fish. Or you can reduce the water level a couple inches so the water splashes back in, aerating more.
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves