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So if your flatworms are red planaria, here's what I would do. Start by setting up a siphon like a water change and put the end of your siphon into a filter sock. Try and suck up every single one you see on your rocks/coral/sandbed. Use a turkey baster in tandem with the siphon to blow them off the rock. When you hit them with the flatworm exit, the water can become toxic extremely quickly and cause the coral to die off. Therefore, if you can remove 90-95% before you treat, you'll mitigate the risk.
Following this (and you may need to add water back to the tank several times as you siphon), I would set up 5 gallon buckets and pull each rock one by one and swish the hell out of them in the water. This should help with dislodging the ones you didn't see.
You can then dip your corals in revive.
This all assumes you're dealing with red planaria, in which case you can then use flatwrom exit as a tank treatment (following the directions to the T). If these aren't red planaria, but are AEFW or another flatworm, then it's a bit different.
If you have some rigid airline tubing, this contraption made by Marc Levenson might be perfect for you then (slow flow rate means you'll have tons of time to vaccum in your 5 gallon):
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Do you know if that’s all 1/4” tubing??If you have some rigid airline tubing, this contraption made by Marc Levenson might be perfect for you then (slow flow rate means you'll have tons of time to vaccum in your 5 gallon):
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Which - Flatworm exit but risks are toxins released by ded flatworks from the chemical. Depepnding how many you have, siphoning up is first defense followed by Melanurus or Lunare Wrasse. Even a blue velvet nudibranch should eradicate them.
Correct. May take up to 4 treatments. Siphon any you see and treat at 80%of recommended dosageSo are you saying that Flatworm exit is not toxic? If that's the case would i be alright doing follow up treatments every 2 days with it to kill say less than 5 Flatworms without changing the water afterwards? Basically just let the Flatworm exit sit in the water for a few days to kill any flatworms that pop up from the sand.
I dosed my tank with Flatworm exit and I saw a few floating around but it still looks like some may have survived so i may have to redose.

