Hi oysterboy,
No, you didn't permanently kill off "the biological filtration" process because the beneficial bacteria would rapidly recolonize the live rock after it was returned to the tank. You may have killed off a lot of the other life in and on the live rock and maybe it's some of this life inside the live rock that has not yet completed the process of dying off.Originally Posted by oysterboy
How long ago did you return the live rock to the aquarium? Has your nitrate been high ever since then?
Yes, your aquarium is overstocked in tangs. Personally, I think it's too small for any of those tangs but you might be able to keep just the one yellow tang. The naso tang and the sailfin tang in particular require a tank that is much, much larger than yours.
There are a lot of other fish that would be better for your tank. I wouldn't choose anything with an adult size above 4" if I were you. Your tank just isn't large enough for big fish.
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