Yesterday I was changing the water in my ten gallon, and I forgot to turn the heater back on after I was done. Today I came back from school and saw that the heater was off, and one of the fish in there (a betta) was looking more greenish than usual. I think that there is a good chance he might velvet:( Checking the other fish in there, I saw that one of them has a gold sparkly section under it, and another that looked a bit sparkly also (though it might be my imagination).
The fish in the tank are 2 bettas in breeders (not the best idea I know, but I'm saving up for a new tank...), a third betta in there temporarily due to a different cracked tank, a molly (I bought her not knowing they were brackish fish, and after research I learned they could also survive in freshwater), and a platy. Again, it is a ten gallon tank. The molly and platy do not have a gold iridescence, though it is quite hard to tell with the platy being pumpkin orange. All the fish are eating. I can't tell if they are rubbing themselves on decorations/tank sides.
Please help guys, I'm panicking right now and don't know what to do