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Think an algae blenny and bi-color would fight in a 72 gallon tank? I've never mixed blennies before, I hear they can really dish it out to each other though.
I have a algae blenny and bi-color in my 55 gal with no problems. They were introduced at the same along with a midas. The midas and bi-color would fight over the best hiding places at first but settled down after a few weeks. Good luck.
I got a midas and a small sailfin (thought it was a bi-color when I first got him) in a 155g. Every so often the larger midas (twice the size) would chase the smaller sailfin, but only for short bursts to claim his territory.
I'd go for it. Plenty of rocks for both to perch on right?