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Originally Posted by DJ's left nut
I've never run a QT tank, though I probably should.
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Same here.
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Originally Posted by DJ's left nut
The problem is that marine ich is something of an ornery little shit. Wild-caught fish all have it and virtually any distributor is going to run a mass filtration system that will pass it around as well. Freshwater ich is a different creature entirely; it's much more rare.
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Actually FW ich isn't all that rare. It's just easier to control. I don't know about marine ich, but with FW ich, if you see it on the outside of your fish, you've already lost an important battle. Ich establishes in the gills so your fish will be very sick before you ever see the actual spots. Fish hovering at the surface, appearing to "gasp" for air, is a sign of ich.
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Originally Posted by DJ's left nut
Oh...and I'm sure (I hope) that you know that virtually any treatment for ich cannot go into your reef. All of that stuff will kill your inverts, generally including your corals. It will get into your live-rock and never really cycle out. Worse still, it will get into your seals and run the risk of making that tank 'radioactive' in the future.
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It's because most of them contain Copper, which is highly toxic in even moderate concentrations. It's very, very difficult to get rid of but it's not impossible. In a marine tank with lots of inverts and corals though, it can absolutely create a situation where the tank is toxic forever. I really suggest trying Kordon's Herbal Ich Attack. Great product with no copper.
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Originally Posted by DJ's left nut
Water changes are also a big deal. People forget that the salt is more than just salt; it has a bunch of minerals and stuff in it that are pretty helpful for having healthy fish.
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This is absolutely true for FW tanks as well. Even low pH Amazon-style tanks need proper mineralization.