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40 gal is a bit small for virtually all tangs. they need lots of swimming room - kind of like getting a lab puppy and keeping it in a 5'x5' townhouse backyard. not enough exercise, induces stress, makes them suseptible to disease. i dont see a skimmer on your system description - tangs produce a lot of waste, you must have a skimmer. how are your corals doing? This is a good indication of water quality. what kind of tangs? what kind of angel? in a 40 a pygmy angel such as a flame is the largest you can keep. for a tang, your tank needs to be over 4' long.
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