From what you said I'm gonna have to agree with everyone on here that it sounds a lot more like aefw then red bugs causing the problem.

Here are some macros of RBs, hopefully they can help you with an ID on your problem.

http://i21.photobucket.com/albums/b2...redbug_800.jpg

http://i21.photobucket.com/albums/b2...45700_2943.jpg

Perhaps try taking some shots of your own colonies and we can help you make the proper ID. However if you've IDed the cause as RBs, you've clearly found two different sources for Interceptor, and perhaps you should choose one of those two and begin treatment.

I wonder if acro crabs eat them?

No, they don't seem too. At least not enough to control them.
Try not to buy dead, red bug infested acros and everything will be fine!

Pics
 

Thats is exactly what I have in my tank they fast too.

So I guess the next two steps for you are;
1) Either pay the vet or go through the pet store to get the pills. Its good to keep a box on hand so that in the future you can use them in QT.
2) Prep your tank for a treatment; remove your inverts, or remove all your acros to QT, and figure out your required dosage.
3) Set up a QT system for new arrivals, and figure out how you want to handing incoming livestock from now on.

Michika
 

Well I found some one selling me a package of it. No names will be mentioned. But thank you for your advice. From now on I know I will be dipping any corals that will be going into my main.