Made some quick changes and I'm going to try to make some more changes and spruce it up a little this weekend
I think I've only been working on this for the last 12 years. Sadly it hasn't changed a whole lot from the original list... I know, I'm a slacker
Fish To Be Avoided: (fish with incredibly low survivability in aquaria)
Moorish idol
Regal angelfish (Red Sea Specimens tend to be hardier and more willing to accept prepared foods)
Rock beauty
Bicolor angelfish (Often caught with drugs and generally a poor feeder)
Centropyge multifasciatus
Holacanthus venusta
Most Anthias
Clown tang (VERY ich prone and a finicky eater, horrible survival rates, when they do live they can be quite mean)
Clown sweetlips
Pinatus and tiger teira batfish (batavianus)
Orange spotted filefish (specialized coral polyp feeder)
Most butterlyfish (except those listed below)
Ribbon eels (rarely eat in captivity)
Cleaner wrasses (specialized aparsite feeder, leave them in the ocean where they can do their job)
Twinspot goby
Sleeper gobies (Valenciennea sp.) (Often starve to death even when accepting prepared foods)
Tilefish (VERY timid and difficult to get to eat, also excellent carpet surfing)
Rays
Parrotfish (too large for most tanks and certainly not reef safe)
Grunts
Anampses spp. wrasses
Leopard wrasses (Macropharyngodon spp.)
Pseodojuloides wrasses (very dificult to keep alive, they almost always die in transit so you don't see them very often if ever)
Tassled filefish
Jacks
Drums
Trumpetfish
Remoras
Chambered nautilus
Fish Best Left For Experienced Hobbyists:
(finicky nature, parasite prone, specialty feeders, require specialty tanks or threatened species)
Genicanthus sp. angelfish (hardy once acclimated, but lots of problem specimens due to the depths they are usually caught at)
Catalina gobies (coldwater species)
Garibaldi (coldwater species and protected)
Trunkfish (box and cowfish) (most are rather sensitive and can release tocins when stresed or dying)
Clown and Gumdrop gobies (once established a good surviver with less boisterous fish)
Radiata lionfish
Fu manchu lion
Dwarf zebra lion
Anglerfish
Mandarin dragonet (requires large amounts of live food typically which can be provided naturally in 50+ gal. tanks with a good amount of live rock)
Most large angels (require large aquariums and often specialized feeders)
Acanthurus sp. tangs (ich prone)
Ctenochaetus tangs (ich prone, some of the hardier tangs once established)
All butterflyfish (except vagabond, longnose, Heniochus, golden, pebbled, Klein's, Lemon, Auriga and Racoon, which need large tanks)
Sea horses
Seadragons
Pipefish
Anthias (require a good amount of swimming room, peaceful tankmates, and frequent feedings, often unhealthy and starving by the time they make it to dealers tanks)
Blue chromis (someone want to remind me why this is here?
)
Longnose hawkfish (jumper)
Octopus
Cuttlefish
Porcupine pufferfish (very disease prone)
Fairy wrasses (Paracheilinus and Cirrilabrus spp.)
Dragon wrasse
Red coris wrasse
Red sailfin blenny
Striped blenny
Scooter blenny
Sandhopper
Jawfish (require tanks set up with their needs in mind)
Undulated triggerfish (unless housed by themselves)
Convict tang (very aggressive)
Fish That Require Huge Aquariums (200 gallons or more):
Sharks (require much larger than 200 gal., Nurse sharks can grow to 14ft. long!)
Most groupers (especially panther groupers)
Parrotfish
Snappers
Naso spp. tangs (however, they can be slow growers)
Moray eels (large species)
Garden eels
Soldierfish
Orbi and spade batfish
Twinspot wrasse (Coris aygula) (beginners take special note of this one)
Flounder
Venomous Species:
Stonefish (can be deadly)
Lionfish
Rabbitfish
Scorpionfish
Coral cats
Bluering Octopus (can be deadly)
Toadfish
Inverts To Be Avoided Or Better Left To Experts:
Non-photosynyhetic corals and Gorgonids (sun polyps, carnation, devils hand, etc.)
Christmas tree worms
Goniopora sp.
Feather stars
Basket stars
Crown of thorns (duh
)
Linkia stars
Many wild small-polyped scleractinian corals that are not frags
Sea apples
Sea pens
Giant Xenia
Sea slugs and Nudibranchs (very few exceptions)
Flame scallop
Anemones (see below)
Bright yellow anemones {dyed; most anemones have no business being in reef aquariums and usually should be placed in specialty tanks)
Harlequin, clown shrimp (specialty diets)
Camel, mechanical shrimp (Not reef safe but often sold as as such)
Elegance coral (recent poor survival)
Red serpent starfish
Tubipora musica (organ pipe, usually hacked off from a larger colony)