My engineered goby was living in hus own tank for the last 3+ months until my husband decided to add 2 new moorish idols to his tank. Both idols died within a few days. About 2 weeks later (today), I went to feed the goby while husband updates the DT and find him COVERED in white with "rot" spots on some areas and cloudy eyes. Afyer feeding him (he didnt eat), he's no longer hiding (as usual) and is hanging onto the heater box. Should I FW dip? Ruby Rally or Prazi? It's possible this disease came from cross contaminated equipment as our Cowfish is also in his own tank and not doing well with similar symptoms.