IM 20. -- In-tank flatworm treatment experiment
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The green flatworm population finally got out of control... every surface covered... Decided to experiment a bit to find minimal dosage of melafix to deal with the problem.
Since this is a my spill over frag / holding setup, I rarely look at it... though I should, since I have a lot of fire in there. whoops. In any case, I use a strong melafix dip to typically knock off worms and the like. And given that worms are on glass, walls, heater as well... then really no way to deal with it without a restart or chemicals like flatworm exit.
But figured, it's the devil you know vs one you don't. Melafix is clear about what is in there and generally safe for fish, corals, etc.
So questions are: will it work for in-tank treatment, and what is the minimum dosage?
Answer: 0.75 ml per gallon using Melafix Pond. For Melafix Marine, it's 6X recommended dosage. I left my system running with melafix for 2 hours prior to water change and carbon but saw effectiveness after 15 mins where most flatworms were either curled or falling off. Some pods also got affected but not all -- small sacrifice!
One point of consideration -- if you follow standard dosing instructions of melafix marine, you get to the same concentration I use over a weeks time which is the treatment window with daily dosing. Granted, some of that will have broken down through that period but while 6X the prescribed single dose seems high, it's not too unreasonable for a short window.
Interestingly enough, my water came out yellow after the treatment -- likely from exploded flatworms (green ones have chlorophyll).
No loss in corals, and everything is back to good.