This is my first time ever owning a aquarium. I had a few fish in my 10gal tank for about 2 weeks and they caught some sort of infection and all died. The infection was some sort small little flakes or dots stuck to their body and their scale peel a bit. What can I do to prevent this? I have a penqiun marineland biowheel filter. I used tap water to fill up the tank and Prime was added immediately and was left alone for 48 hours before the fish were added. And also during those 2 weeks that my fishes were alive a lot of bubbles develop on the surface, if I closed my lid overnight...in the morning almost the entire surface would be covered with bubbles. What could I to keep my fish alive and to get rid of the bubbles? Thanks in advance for the help.