The 50/50 deal is what it is.

It is very effective of killing more than 50% of all bad things in the tank and I would say more.

I think that for the most part for those that have REEF systems this is a bad thing. They actually will destroy what you are trying to achieve. Bacterials and animals alike.

If used for a fish only system they are a godsend. But you cannot use this on a reef system and get good results. I tried and failed, removed the unit and what do you know, I got pods, mysids and all kinds of goodies.

It is really a tough call as to when and what your using these units for. Size really matters on these units for the measures.