Sorry to hear about the sailfin. Don't be hard on yourself. Most likely, the fish was stressed from either being collected or shipped.
I agree, the QT has plenty of hiding places and looks great! I'd remove the rocks and barnacles if you add copper, and replace them with pvc pipe pieces just big enough for the blennies to fit in. That way, you can use the rocks on another set up or your display.
How big is your display and QT? If the display is significantly larger, maybe the two "problem" blennies will have enough room to avoid each other.
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Blennies Rock!
--Kevin Wilson
Current Tank Info: 101g 3'X3'X18" Cubish Oyster Reef Blenny tank, 36"X17"X18" sump
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