well, to start
-get rid of the green brittle star - they can be fish eaters
-maroon clowns are usually very aggressive to other clowns and sometimes other fish - so keep an eye on it
- damsel fish again can be very territorial
-sailfin tang will rapidly get too big for a 90 gallon and should be re-homed
-sandsifting starfish eat the microfauna in your sandbed and can rapidly eat itself out of food. If your starfish is dropping legs or your hermits are eating it, it is in trouble and should be re-homed.
-crabs/hermits are opportuninstic feeders and although many are sold as reef safe, they can sometimes eat some desirable inhabitants if they can catch them.
HTH
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180 gallon LPS dominated reef
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