Actually, we actually had those here for the kids... they drain batts FAST and they don't corner well.
In all honesty, no shark will live in a 180 well.
Is it possible to keep a shark in a 180 gallon. Basically - YES, just not for it's entire life. While it's quite possible to keep a juvenile Bamboo, Epaulette, horn or Coral Cat in a 180 gallon, for a little while. But as adults these species are just too large to be kept in a tank that small.
Also - most standard size aquariums aren't designed for keeping sharks. The small benthic species(ones suited for home aquaria) of sharks actually do best in small ponds.
Here's some good basics for minimum size ponds for these types of "home aquaria" sharks
Bamboos (Chiloscyllium sp.) - at least 400-500 gallons
Eppies (Hemiscyllium sp.)- at least 400-500 gallons
Coral Cats(Atelomycterus sp.) - at least 250 gallons
Horns(Heterodontus sp.) - at least 500-1,000 galllons
Yeah - we're talking about SW sharks - such as bamboos, Eppies, horns. BTW you are aware that Iridescents will eventually out grow a 180 gallon tank - Right? As they can grow up to about 4' long.
True - with limit of 120-180 gallon range, you can have some pretty cool Predator tanks that don't include sharks.
yea i have been there done that i have been really wanting to do at least one or two but dont want to cram something that wont have any room as of now i have african rift in the tank and was thinking of doing away with them
would like to also get a bigger tank but you know the my better half will not go for it i already have a 90 & 40 reef and the 180