Since your tank is not a SPS dominate tank (At least I think so anyway) I would bet they are not red bugs. Flat worms seem more likley. A common specie had a reddish-brown coloration to them and the can reproduce into huge numbers very quickly.
If this is the case, I'd vacuum out as many as possible, fresh water dip the item that are safe to dip, treat the items not safe to fresh water dip in a bucket of aquarium water with flat worm exit and then when after doing all that, treat the entire system with flat worm exit. Have newly made water on hand ready to perform a water change and have fresh activated carbon on hand as well.
I suggest this because these little buggers are pretty toxic, if it's a heavy infestation, killing them in the aquarium can have serious negative affects afterward. Killing them in buckets and by freshwater dips outside the aquarium is much safer and can get the "in tank" populations down where it's not as risky treating the tank.
THis is assuming that it is flaw worms of course. Can you take a pic and post it?