2 tangs in 125

Nothing wrong with a hippo in a six foot tank. With all respect to RC according to that info noone should keep them. How many folks have 8 foot tanks? 6 feet IMO is fine for this fish for a mvery long time.
 
I would be careful with the hippo. I had a hippo and a yellow in my 100 together for about a year. As the hippo grew from about 2 inches to 6 in a year he got very aggressive and just this past week killed my yellow tang.

If you can I would stick with just one or start with very small tangs and trade them up as they get more mature and aggressive
 
Yellow tang no problem at all.

Regarding the common blue tang (Paracanthurus Hepatus), it is the most abused fish in this hobby, simply because it's commonly available and inexpensive. The truth about this fish, however, is that it is a good-sized tang with very active swimming habits. Like tangs from the Naso family, it swims all day long and really needs as much space as possible. If you have seen a full-grown 8-10" blue tang in a large aquarium, you'd understand why a minimum of 8-foot tank is optimal for its longevity. RC did not recommend an 8-foot tank for no reason. This fish swims more than other tangs with similar adult sizes, hence it needs a bigger tank.

A 125g is really not a big enough tank for a blue tang once it reaches 5-6", which it will quickly considering how fast this fish grows. I would consider a smaller tang such as powder blue, or the bristletooth family (kole, tomini, etc.).
 
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