QT will only work if we QT our new fish up to 30 day due to the ich cycle. However, I guess many people like me lack the space and time to go through the full cycle.
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If there are no spare empty spare available in the tank, hermit crab will attack snail ect to "snatch " his shell as their new home.
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I agreed with rayl as well, the best prevention is to boost up the health of the fish with some vit c in their food ect.. just like human being, if we are healthy we don't fall sick or catch a dieases easier.
it is not difficult if you have the money.. heehee just kidding.
fortunately this hobby is cheaper and easier to start now as compare to before all thanks to china !
i had similar experience as you with my old 4ft tank. Lazy to change water for about 6 month i think and LPS like hammer and touch corals is still doing very well and growing. Except for brain and SPS corals which i having problem maintaining it. I guess some of the corals is more tolerance of water parameter whereas some are not.
But the most obvious thing that i notice after a small water change is the coral color seem to be brighten up after the WC.
Starfish and anemone is not easy to keep especially for a new tank.
Meanwhile try dosing more bacteria to boost up your bio filter
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