Your not really suppost to clean a fish tank.
Woah! You need to be doing some water changes. Yes you can clean a fish tank. I'm not talking take everything out and clean it but some general maintenance needs to be done in this case. You have beautiful fish but you need to be taking care of the water too. What are the parameters? You could do well with some snails or other cold water algae eating species. (Not too familiar with cold water but nonetheless)
What kind of water changes are you doing, how long has the tank been set up and how big is it?
I would advise reducing the amount of light per day to about 6-7 hrs. Look into finding a suitable algae eating fish or invertebrate.
Try a bristle nose.
The orange one is al capone, the calico with gill covers is road runner and the calico without gill covers is gills. She was like that when I got her, I dont think she got enough nutrients when she was a fry they never seem to have formed.
I do think they're pretty. They just need some help so they can truly be gorgeous.