Catshark

Agreed, although many people have setups that don't meet the actual space needs of their fish. Some smaller fish like clown, gobys, damsels, dragonets may only have a small territory in the ocean, while it's almost impossible for the home hobbyist to natural space needs of fish like tangs, sharks, rabbitfish etc.

 

I already have 180 gallon tank, it is just not set up yet

 

Then I would wait until at least the 180 is setup and running. Keep in mind that a 180 is still on the small side for sharks.

 

it would really depend on what species of cat sharks as some are very simple to keep such as bamboo cat sharks of which as predominatly benthic, nocturnal and cave dwelling hence do not need heaps of swimming room, other cat sharks from the open ocean that are not benthic dwellers do need a larger space for swimming and those open ocen species need very large circular tank so they can swimm without running into walls. if it is just a small bethic species then it would be fine to keep it in the smaller tank untill it has learnt what is food and where it all is etc then move it to the bigger tank hence using the smaller tank as a sort of qt/training tank for it. good luck

 

Mine is the bamboo and that's exactly how he acts. Although I still think a 75 is much to small.

 

Over the years, I have rescued, rehabbed, and then re-homed many batoids and sharks. I have to agree that you should have the proper sized tank BEFORE buying them. When they get too big, zoos or aquariums will NOT take them off your hands. Heck, they won't take them when they are still small. If these people would have had a proper sized aquarium from the beginning, I never would have had to rescue them. (Worst case was an Atlantic Bat Ray that couldn't even flap his wings because he was only in a 120. Boy I have some funny stories about giving him his daily antibiotic shots to clear up infections caused by the wrong type of sand and having a bunch of LR in the tank).