I've had this six line in QT for about a week now and a light patch on his body started showing about a day ago.Anyone know what he's got and if it needs treatment. Thanks guys!
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I'm going to say it's likely bacterial and should probably be treated with antibiotics. Kanaplex and/or furan-2 would be a good start.
Antibiotics
https://www.reef2reef.com/index.php?threads/Antibiotics.283711/
Are the two medications suggested safe for crabs.. in also qt'ing 5 hermits