btldreef
Moderator
Out of the three tangs you listed, if you MUST have one, I would say, go with the Yellow Tang, NOT the Hippo. Our hippo produced a tremendous bio-load, even as a juvi and I found from personal experience that they're hard to keep when young.
I personally would not keep a tang in a 55G, but if you're not going to have that many other fish, one might be okay, just have a good CUC and skimmer.
Now for the "Tang Police" statement:
Please keep in mind that tangs enjoy ample swimming space. 4ft is not a considerable amount of space for a 8"+ fish to swim in, regardless of whether it's a 55, 75 or 90 gallon tank, and in my opinion it is irresponsible to keep a tang in anything smaller than a 120+ gallon tank. Yes, it is true that people do keep them in smaller tanks, but is this really best for the fish? I have seen many tangs in small tanks that do not thrive and look okay short term but eventually die off far before they should have. As a responsible aquarist, one should strive for the closest to natural conditions one can give. Of course, we can't put the ocean in our living room, but providing the fish with the largest area to swim should be something to strive for.
Put it this way, would you keep a St. Benard or Great Dane in a 2-3 foot cage just because it fit and the dog didn't cry?
JMO
I personally would not keep a tang in a 55G, but if you're not going to have that many other fish, one might be okay, just have a good CUC and skimmer.
Now for the "Tang Police" statement:
Please keep in mind that tangs enjoy ample swimming space. 4ft is not a considerable amount of space for a 8"+ fish to swim in, regardless of whether it's a 55, 75 or 90 gallon tank, and in my opinion it is irresponsible to keep a tang in anything smaller than a 120+ gallon tank. Yes, it is true that people do keep them in smaller tanks, but is this really best for the fish? I have seen many tangs in small tanks that do not thrive and look okay short term but eventually die off far before they should have. As a responsible aquarist, one should strive for the closest to natural conditions one can give. Of course, we can't put the ocean in our living room, but providing the fish with the largest area to swim should be something to strive for.
Put it this way, would you keep a St. Benard or Great Dane in a 2-3 foot cage just because it fit and the dog didn't cry?
JMO