I would do a health check, look for red on belly, dry skin, incompete sheds. Just check them over once a week. Are u doing regular cleanings, u said 4 months, have u done your first clean? It could be a build up of toxins. Or could be agressive tank mate. 1 inch is alot to a frog. Mine are 1/2 inch in difference and the little one always gives the other first dibs on the favorite water dish, and of course, it's the small one. I hand feed to make sure lump(smaller1) gets full. I seperate them when I hand feed, kermit always bites lump, in the face!!! So change water, clean favorite resting spots 1x a week, and handfeed when nessisary. As far as deep cleaning, that could be issue, but each viv is different, plants cut down waste, but something to coinsider.





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