I was going to try the spectracide but I'm under the impression that it's not very pure and has some undesirables. Are you using it in a low nutrient system? I can't get my nitrates up in my sps tank so I'm going to experiment with nitrate dosing, I've been feeding heavy but my fish are fat and I want to find a more precise way to maintain a level of 5-10 nitrate level and low phos.
Thanks