Hi there i had Returned from a 26 day vacation, and i return to my 20 gallon with 2 dea platies and I have 3 mollies, 1 molly is skinny and has a bit of hunched back And 2 other of my mollies seem fine at the moment, i am not really sure what to do now, need some help. My tank is also extremely evaporated with water halfway remaning and the hang on back filter not even being fully submerged.
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