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All our marine fish are dying?!! Help!!?
Me and my partner have a marine fish tank, we had 2clown fish, 2fire fish, 1false grammar, 1 blue tang, 1 blue and gold damsel and 1 longhorn cow fish. They were all happy and healthy and we do regular water changes and test the water regularly. Then all of a sudden our blue tang got ich and we got some treatment from the fish shop and treated the water, we also did a water change. That was about a week ago and now all our fish are dead apart from the 2fire fish and 1clown fish!!! They all got white spots on them and started to go see through and then they struggle to swim and die. We checked our water but everything was normal. What is it? How can we stop our whole tank dying?! Thanks 
xx
....Our tank is 125l
Yes we have a testing kit whichs tests all of the things you mentioned.
Yes we have a powerhead for flow.
Yes we have RO saltwater.
Thanks...x
Ich is very common and also usually only kills the whole tank if things are off. Fish usually only get ich when they are weakened, stressed out or sick. You dont say what size tank you have, which will help. You say the water checked out normal, but what parameters are normal? Salinity level? PH? Alkalinity? Ammonia? Nitrite? Nitrate? Temperature? Also , Marine fish need to be slowly drip acclimated when adding them to a new tank. Are you using tap water or RODI? Tap water varies by city, and some cities tap water could not even keep freshwater fish let alone more sensitive Marine fish.
How about oxygen, is the surface of the tank well agitated? do you have any power heads for flow.
And never add medicine or any chemical to your display tank.