Here is one I am working on:
- New fish is treated for 10 consecutive days with either CP or copper at therapeutic levels (very important).
I do not agree that CP or copper should be used prophylactically. Ten days is not long enough in any case. I discourage copper usage.
- On Days 1, 3, 7 & 9; I dose 75 mg praziquantel powder and 250 mg metronidazole powder in order to deworm, and prophylactically address the possibility of brook/uronema. This same formulation can be achieved by just using "API General Cure". I've had too many interaction issues (bacterial blooms) when combining liquid Prazipro with CP.
- IF a bacterial infection pops up, I've been able to add nitrofurazone (Furan-2) or kanamycin (Kanaplex) to the mix without issue.
I purposely seek out fish with ich, velvet, brook, uronema, flukes, intestinal worms to test this 10 day protocol out on. So far, so good. Of course, being I only experiment using sick fish not all of them make it. The fish with velvet, for example, almost always require a FW dip & chemical bath before going thru the 10 day treatment. And sometimes I have had to continue antibiotic treatment in the observation tank for lingering infections.
But after 10 days, any parasites should have dropped off the fish and are left behind in the treatment tank. The presence of CP/copper shields the fish from reinfection, and you just do a "tank transfer" after 10 days to a whole new QT (nothing gets reused from the original treatment tank.)
So far, no recurrence of any diseases (save lingering bacterial infections) once transferred to the observation tank and all is well with them in my DT as well. But experimentation continues .....