my 2gal naon had aproblem went from spring water to distilled, then finealy tried emerald crab. Well beeing new to salt, I watched every day(2 gal rember)and he ate what he liked first then he ate what was left(red hair, brown hair, green bubble) never touched the red bubble or the brown dition BUT!! the the brown dition did almost dissapeare. Well I moved him to a10 gal beacause, he shead his shell 4 times, the rock was bear and my clown wasalooking'good. Now I have a small emerald and well...... it needs more time(he's not big enough, or hungery enough) Rember!! no!.. skimmmer ,no RO/DI Yes cut my light back to 8 hours(sunlight is aproblem "diffrent spectrum") and watched my feeding.