(1) Tanks that look like colorful coral collections than natural reefs.
(2) SPS dominant / exclusive tanks.
(3) Designer Clownfish. Wouldn’t want to touch one with a ten-foot pole.
(4) “Unique” tank designs (AKA non-traditional / non-rectangular tanks).
(5) Aberrant Scopas Tangs. Black Tangs. Any man-made hybrid (looking at you, Yurple). “Rare” / “Unique” < actually attractive.
(6) Overcomplicated tech.
(7) Fake corals. Artificial decorations. Just no.
(8) Lionfish. Anglers. How many even have long-term success with them to say that’s their natural lifespan?
(9) Tang Gang (feel free to shoot me). Angel and Butterfly collections are far more interesting and prettier to me.
(10) Governments (of the world) and their impact on our hobby. Why do we need to be “ruled” over?
(11) Blue Tangs. How many people have a big-enough tank for one long term, and for some reason just never appealed to me.
(12) PJ Cardinals. Even single adult one I saw at a public aquarium was ugly, washed out, big and added absolutely nothing to a tank.
(13) CB Misbar Regals. Sure they’re not “intentionally” that way like designer Clowns, more an artifact of captive breeding and being misbarred is not exclusive to P. Diacanthus, and to be fair a Y-bar or slight misbar on a Regal can be quite attractive to me, but I still prefer the straight bars and it’s cringe for me to see the Misbars selling for more.
(14) Most of the schooling / shoaling Anthias. I can get on board with the big ones as well as the rarer deepwater types, but the ones like Squampinnis / Dispar / Bartlett’s and those ones were never my thing.
(15) Firefish. Dartfish. Not many seem to have long-term success with them, or maybe they just don’t live that long.
(16) Fairy / Flasher Wrasses / any of the more common Wrasses imported as adult males or terminal males. Just not worth the $$ for a fish already having lived out half or more than half its life and will probably last another 3-4 years (or less) in your care.
(17) Getting a fish that will have to be given away due to eventual size. Never made much sense to me. Sure it’s nice to see something like an Emperor Angel change from juvenile to adult coloration, but knowing you don’t have the tank to sustain one for decades, it would make me sad.
(18) Not having a lid or a top. Proponents will say that it’s okay to take the risk and don’t want their tanks to look “ugly”, I never felt that way and why take any risk at all, when you can minimize it?