Are you using the Tetra Laborett...with the drops? My first suggestion is to invest in a reliable/professional saltwater specific test kit, instead of a $25 fresh/salt water kit. You are spending a lot of money on fish...take some of it and spend it on good test kits. There is, for example, no nitrate test in that kit. You may wish to get an alkalinity and calcium kit, in addition to ammonia, nitrite, nitrate, pH. Perhaps Tetra has other kits (I know they have individual versions of the laborett), but I do not care for these types of tests when precision is required.
Sorry to hear the clowns died as well. I don't remember reading that until now.
FWIW, I think people (including myself) are pleased that you have stopped adding fish, but after your post yesterday saying that it was basically SWF fault that your fish died, well, I am wondering if you are taking responsibility for the fish deaths (aka "mistakes") or not. Excuse me, and others, for being harsh on this issue. If the lesson is learned, so be it, good news all around. But only time will tell.
And that time will come up in a few weeks.
Please seek advice on which fish to add at that time, or this episode will repeat itself. I hope you appreciate that in reality, it was severe overstocking of incredibly inappropriate/delicate fish that caused their death, and not necessarily the initial health of the fish.
Consider some of these posts a sort of 'tough love, scared straight" approach. We are willing to give advice, and have done so for awhile now with regard to this particular tanks, but people should be willing to learn and accept responsibility. The absence of the latter tends to result in less than pleasant posts, such as the one above, which will hopefully be the last of the sort in this case.