You don't have backup pumps/powerheads?No, do not ever add amguard to a reef tank.
don’t insert one iota of doubt into a perfectly known system. This reef is not in ammonia concern, neither is any other display reef. We expect periods of higher vs lower ammonia, the tanks handle it within range always, no help needed after a cycle, firm rule. You don’t buy anything just in case, or just to be sure, or for maybe. supports to biofiltration are not needed in reefing and are fear based sales only.