You will need to remove all the fishes in your tank. When ich dont have a host they can't survive. Need to leave the tank fish-less till the ich cycle complete
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Hi bro, I remember reading an article online saying most or all crabs will eat things they shouldn't eat if their diets are not sufficient. Not sure if that's the case for you
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100% water change caused removal of a big mass of beneficial bacterials. Causing the tank to go into cycling mode. I do heard of some people got away with it but most didn't.
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Sg reading is affected by temperate in water. Does the refractometer has auto temperature compensation ? If I didn't remember wrongly most refractometer needs to be calibrated once in a while. Try taking the reading with the same temperature
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