Flow too strong will cause thee mushroom to detach itself from the rock. You can try shift it to another location or adjust your wave maker
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How long have you kept the porcelain crab? I find it always hard to keep it alive as it only feed on micro organism in the water.
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It is best to place it high at least 1 feet from water level. This will help improve the light spread and protect the light set from water splashes which could damage the light.
Don't under estimate the light, my tank height is 2.5ft tall and placed about 1.5 feet above water level still I can keep some easy sps at the sandbed.
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I would choose zero ex from madpetz for the price and build quality of the canister. For the replacement filter, it is the same as those that you can get from water filter store as well.
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However, just to share that it is not recommend to use the High Par / high UV setting instantly like mine to burn the colors. Experience tell me that the newly purchased corals will not be able to take the High Par / High UV setting in the tank which usually result in coral bleaching. This is where the acclimation function come in very handy to slowly adjust the intensity up .
i took about 3 to 4 week to acclimatize new corals to the light setting.
Week one - 50% reduction
Week Two - 40 % reduction
Week three - 30 % reduction
Week Four - 20% reduction
Red, White, green max 60%
Blue, Violet, UV ,RB max 100% for 52 but slowing increasing it to 110 % for 52HD to see if it can color up those sps nearer to the sandbed.