Wow. Be very wary of the lfs
(local fish shop) and the advice they're giving. You are currently cycling a tank with fish most likely. Ammonia is high and it hurts fish. It'd be like you swimming in a septic tank almost. Clowns are damsels, which are very tough fish, but cycling a tank that way hurts them. Cycling a tank with fish is a very old practice in the trade these days IMO
. Read our articles section on cyling a sw
tank the humane way.
Also, a 29g is not a large enough tank for ant tang. The yellow tang needs a 6ft swim. 125g or larger.
If you can, get an ammonia and nitrate test kit right away, read up on cycling a tank and you'll know what the tests are for.
Good luck. Stay in touch. We will help you. Read this and do more research on the subject. http://www.aquariumadvice.com/articl...ank/Page1.html
This is a real exciting hobby and its easy to do what you're doing right now - which is relying on someone who wants to sell you something and making mistakes that will stress your fish and you and not allow you to enjoy the hobby.