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Is there ways to do hypo without one? I'll be honest, formalin scares me. I'm not comfortable messing with it
When using hypo to treat flukes, you have some wiggle room as you only need to maintain 15 ppt (1.011 SG) for 5 days to eliminate flukes & their eggs. So, just set the SG to 1.009 (regular hypo) and don't let it go over 1.011. 1.009 also eliminates some strains of ich (if he has that), but there are also hypo resistant strains of ich to consider. However, the SG would have to be maintained at exactly 1.009 for 30 consecutive days to have any chance of success with eradicating ich.
It is also possible that the tiny white specs you saw were the larvae, which the second round of Prazipro should eliminate completely come Saturday.
When does the copper + test kit arrive?
If you were me, what would your next step be? Wait it out til the second dose of prazi Saturday, go ahead and start lowering the salinity, or start with the copper tomorrow evening?
I believe what you saw in the FW dip was probably hatchlings (and not prazi resistant flukes), so I would proceed with the second dose of prazi on Saturday. You could perform a second FW dip 4-5 days after that to confirm flukes are 100% gone. If they are and he's still scratching come then, start raising the copper.
That is what I would do in your shoes.
Oh, @Humblefish should I just do the 24 hours again or do a full 3 days this round?
24 hours of prazi exposure is all that is required and wrasses aren't especially fond of that medication anyway.
Exactly my thoughts. The gills are typically where wrasse are affected and why at some point they sometimes drop dead seemingly for “no reason”Swimming into flow? Hiding from light? Breathing rapidly?
Wrasses are tough, I've had quite a few wrasses and have seen tangs break out in ich or velvet while wrasses are just going about business as usual. Their thick slime coats keep infestations primarily to the gills, where they are still dangerous but less obvious to the casual observer.
If he seems to get worse rapidly, I would consider the fw dip...not necessarily to look for flukes (though can still keep an eye out) but also to clear parasites and mucous from the gills and give him a bit of relief from whatever is ailing him.
But, I have noticed in my own experience that some fairy wrasses are a bit more sensitive to fw dips than other fish. I've had to pull a couple before they actually went the full 5-minutes because they started to look distressed. Still helpful in an emergency, but use caution and observe carefully if needed.
Also, once you have finished the second prazi round... I'd suggest maybe running him through a round of copper prophylactically.
For the same reason it's often hard to tell what's bothering them, they can sometimes hide symptoms all together and become a "carrier" infecting other, less-resilient fish in your display. I know there are varying opinions on prophylactic treatment, but that's my take on it with wrasses in particular.