Check water flow, check for neighbours that may be bothering it at night. Double check your water, take a sample into a LFS and make sure they're getting the same thing you get when you check pH, Nitrates, etc...
Frogspawn and hammers are not supposed to like lots of flow, mine however seems to so maybe make some minor changes but by all means as was mentioned earlier, QT tank if you can and if not try to beg borrow or... find one.
Doug
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