Temporarily storing fish

[BCOrchidGuy]

It would but if you want to remove the stuff, let filters run etc until it's fairly clean, then clean or replace the filters. Just remember to keep the clown fish at a temp similar to what it was at in the tank, an airstone or a power head will keep the water oxygenated.
If you lived closer I'd lend you a 5 gallon tank to hold your clown for a couple hours.

Doug