I make it just thick enough to flow through the syringe. ( I use a kent sea squirt) and squirt a small puddle onto the head and bury it when it retracts.
If you have as many as u say you probably want to throw in some water changes in there because Kalk will raise PH. but since I got so few (maybe 4 or 5 every few weeks or less if I find them) I don't have to worry.
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