10 gallon salt water for clown fish

You could do 2 percula or occeleris clowns in there, and thqat would be pushing it. For saltwater the bare minumum of stuff you need to have is a HOB filter,live rock, a sand bed(preferably a deep one if he's not running a skimmer), and a whole whack of test kits, and enough lighting for the fish to tell day from night. This setup would be quite hard to deal with for a noob to fishkeeping, and will most likely have algae problems after a few months.

If your friend were to set upthis tank with his curent knowledge, I give the fish a 5% chance of living more than a week. Ask him/her what the nitrogen cycle is, what live rock is, what amonia,nitrite,nitrate and PH is, and how he/she plans to deal with algae problems. If you friend doesn't know what all of these things are, he/she is not ready to set up a salt water tank, and posibly not even a freshwater tank. Please, educate your friend about AC, and save the fish.