Originally Posted by boalgf
That means I can have an adult foxface, an adult blue tang, and maybe a clownfish in my 125? And a 55 can have a dwarf angel, a clown, and maybe a chromis? Those "rule of thumb" standards are nonsense. Go off of your filtration, live rock, fish compatibility (to include general aggression), and then base it off of experience.
I've got 3 dwarf angels living happily together in my 125, they used to be in my 90. The coral beauty is one of the best dwarf angels to try out 2 angels in one tank. They are one of the more passive dwarf angels. I suggest you wait until you get your 90 before trying it and then try it with another peaceful dwarf angel.
I have a flame angel and coral beauty in a 125 with no problems, and I also had an Indian yellowtail angel with them, and there was no problem (until the IYT died).
aside from the 2 angels, I also have a yellow tang, hippo tang, kole tang, tomato clown, 5 chromis, and a bi-color blenny.
now I also have a 65 gallon sump/fuge, so my actual amount of water is more like 190 gallons. but I agree with you that "rules of thumb" are silly. I have always had at least 3inches of fish per 5 gallons with no problem. it all about maintenance and filtration. also, my 3 tangs make A LOT more waste than 25 1" gobies, so that alone shows the rule of thumb isn't all it's cracked up to be.