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Hi Dmort yes true you could always add that one fish or coral and bring in something devastating. But equally even with QT if you run natural seawater DT changes theres a risk of picking up potential viruses and bad bacteria from ocean water. Point being we cant control everything so IMO best approach is to concentrate on the best possible water quality and livestock immunity from healthy feeding. In my sump (and this is cheap to do) I simulate a beach, a tidal zone, deep sand press, and mangroves set up tidal 3 hours on off wet dry as well as macro fuge, big skimmer, nitrate bicks, uv ,ozone, zeo, phos, carbon. This seems to allow for heavy fish stocking with about 40 corals so far mainly sps. QT tanks are small and provide less cover. This is dangerous to fish that need swimming area. Also prolonged use of copper can damage their livers. Sometimes you will see this in an LFS where for eg anthias , tangs, gobies swimming round rake thin like zombies gradually losing energy reserves. If you can get them straight in the tank and get them adjusted to the system and feeding well the immune system should kick in as the fish fattens and regains strength
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