Robb,
Though it wasn't a bug bomb we did re-paint the house. I just covered the tank with blankets, turned off all filtration and power heads, lights, just kept the return. With no ill effects. I would turn everything off except your return and wrap your tank/stand in plastic. After the bomb is done, open all your windows if you have fans I would have them draw the fumes away from the tank. Leave plastic wrap on until you feel comfortable unwrapping.
The key is to keep the fumes from entering the tank. By sealing in plastic it should be ok, at least this is what I would do if needed.
Dave-