OK, has he eaten in the 6 weeks you've had it?
While you way the stats are OK, you still haven't posted numbers. On this occasion though, I'm not going to ask for them, as they are of little use. Strips are as accurate as getting a friend that does not know a thing about fish to just guess some noumbers for the results for you. While FW strips often read false highs/lows, marine strips only seem to do fasle lows. While the strips may say ammonia and nitrite are 0, they may not be...
Can you test with liquid based test kits, and
post numbers for the results?
Any idea if the clown is wild caught or tank bred?
Were they feeding in the shop, and if so, what on? Did you see the fish eat, or just take the stores word for it/didn't ask?
Have you had it feeding since you have had it home, and what's it fed on if so?
We can't realy give any help/advice without the information I've asked for I'm afraid
All the best
Rabbut