surfnturf
Member
Nitrates are not that toxic to marine fish, they are a barometer used to deduce the health of the aquarium. Levels of 500 to 2400 ppm have been documented at LC50 or 50 percent mortality in marine fish, invertebrates are another story. I did a little research on the species being discussed here and came across conflicting information. They are a relatively easy to keep shark but they are still not "beginner" fish. A 125 gallon tank is given as minimum tank size and length reaches about 40 inches in the wild, pretty small shark. I read that they can survive 12 hours out of water, fascinating.