HoopsGuru
Aquarium Advice FINatic
He will alow me to pay him 50.00 down and 25.00 next week and the week after ,buy then my tank will be ready
If you have velvet or ich, three weeks will not be enough to have your tank "ready". 4 weeks of being fallow (completely without fish) is required to eradicate ich, and I would also go longer with a case of velvet.
Healthy fish do not just come down with parasites unless their immune systems have been weakened....most often by stress or bad water quality. I would take a very hard look into your system before you even consider adding a new fish to keep from repeating the cycle.
How old was this tank, was it your first? I would hate to lose all that in one miserable event, what a desperate feeling :x .