Not sure about the coral beauty but the flame and the CBB are usually pretty good reef citizens. The most likely things to get nipped at will be LPS and clam mantles. I have a CBB with clams and it's fine, dumb fish only eats mysis. Only reason I don't have a flame angel is that I have a potter's angel and I feel it's a bad idea to have different pygmy angels except for in maybe larger tanks (which at 75g mine is not). Anyhow I guess this is neither here nor there but just thought I'd share my thoughts on that - those fish you want could be just fine in a reef. As always there are exceptions but there's reason enough to hope for the best.
As for the testkits .. yeah, not surprised. My suggestion, use up the AP testkits for now, but when they're done, get something like Salifert or Elos. For phosphate there's also now the D-D/Merck test kit, which is pricey but gives you a nice precision on the low range.
I only test for nitrate, phosphate, and alkalinity (use a test kit that measures in meq/l - more on that later). If I'm really crazy I'll test for Ca but I usually don't have to, since I use a calcium reactor, and if it's dialed in right, Ca will usually be a number pretty close to 100 times the number of the alkalinity (if expressed in meq/l). Ie. if my alk is 3.1 meq/l dollars to donuts I'll find my Ca is 310. This is only when things are dialed in right though, if things get out of whack it's necessary to track both.
Or if you want to get really crazy, you can get a nitrate monitor and a phosphate colorimeter, basically a digital reading of the value.
Pricey though, only go this route if (like me) you find yourself absolutely hating the process of deciding which colour of pink matches the colour of pinks on the chart.
Most Ca and Alk test kits are of a titration basis which is nice, which means you count the drops until you get a colour change (usually from pink to blue). Hard to miss the transition and you have a definitive volume value which in turn gives you a number you can have a high degree of confidence in, unlike trying to guess at colour matching.
And as for pH test kits ... I haven't met one yet that I didn't hate.
If you ever decide on a calcium reactor, forget trying to dial it in with a test kit, you'll never do it. Invest the $100 in a pH meter or controller .. it will be one of the best $100 you spend on the hobby.