Well, my friend pointed them out to me, it seems i have black bugs chewing at most of my acro's and monti's. Thought it was just on two or three pieces but after a harder inspection, they are on just about all of them. I've decided to go with sentinel since it works for red bugs, i can use it in the tank and i only have two hermits and one emerald crab that doesn't do his job with bubble algae that i would have to worry about. I figured since there isn't much reported on the black variety that i would document how it works on them. I used half a large dog pill, the 23mg size pill, on a total of roughly 80 gallons of water. Little more than what it calls for, could probably have done only 1/3 of the pill, but from what i've read people have done double that dose without any ill effects, so thats a safe place for me. Dosing started about 15 minutes ago, i'll update periodically if anyone is interested. I do have a mandarin, it will be interesting to see how he does, i know thats a question people have with theirs and the pods that will not make it, but he is also eating frozen/thawed so i think that will make a difference.