Acros with "Burning Tips" and STN - Help

[kien]

for starters I'm pretty sure SPS enjoy alk 7 and up.. Especially if your calcium is at 420, I believe the proper alk should be 8.4(ish) dKH. Here's a chart of the balanced alk and calc values. I'm sure you'll see it from time to time.

Alk meq/L Alk dKH Calcium ppm
0------------0-----------360
0.5----------1.4---------370
1------------2.8---------380
1.5----------4.2---------390
2------------5.6---------400
2.5----------7---------410
3------------8.4---------420
3.5----------9.8---------430
4------------11.2---------440
4.5----------12.6---------450
5------------14---------460
5.5----------15.4---------470
6------------16.8---------480
6.5----------18.2---------490
7------------19.6---------500

I'm sure there could be (and probably are) other things going on but since the only info you provided were Alk and Calc, that's all I had to go on :-) So what else is going on in your talk? What are the other params? Do anything different lately?