Don't let it dry. Use a dropper and drop like 2 or 3 drips of epsom/water mixture on each pellet and let it soak it up then feed him. Imo epsom salt in the water isn't going to treat hex. Chances are the hex is going to spread to your other fish since it's spread through fish waste. So plan on treating the whole tank. If the fish isn't eating your going to either force feed the flowerhorn epsom salt or treat with metro. I know you have the link for treating hex NY RD above. I suggest you throughly read everything in there and make a decision on how you want to treat. Either with epsom salt by force feeding or with metro in the water followed up by in the food with a combo of metro/epsom.
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I will try the metro version in the water first. Then force feed him if I have to. He seemed hungry when I woke up.
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