i need some help

Pretty sure a 75g is a bit small for a yellow. A yellow tang is very active and can reach 8" long.
So in other words, no more tangs.
 
75g is pushing it for a yellow tang. i have a kole tang in my 75g and he's a model citizen and really a beautiful fish.
 
In a 75 gallon 1 yellow is already enough. Wouldn't put any more tangs in there. Maybe try a dwarf angel if you're looking for another bigger show fish.
 
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