I have a couple of old bottles. I was using it per instructions, then stopped. Then one day I was at a LFS and bought a new bottle because I forgot I still had half stuck away in the garage. Now I have two.
One notable experience, I dosed it sloppily and the next day I had an incredible bacterial fog, skimmer overflow, bubbles everywhere. Since then I add a few drops now and then and am a lot more careful if I add it.
WHen I set up my wifes fish tank I used it sparingly as I moved rocks in and out (a hitchhiker anemone started to go viral). Once the nems were eliminated, and dang was that a crazy battle, I left one of the bottles in the stand and I added a few drops yesterday when I removed some chaeto. Following instructions was never a path I could stay on for very long.
I think it has a purpose, especially in new (young) tanks but once things are established it's just a nice drink for the filter feeders and an economic booster for the company. Support your local vendors, and advertisers on here, or by a good bottle of stuff for humans and drip that into your system for more measureable results outside the aquarium if you can't see anything happening using the other stuff.
I can't go so far to call it snake oil. MB7 can have an impact upon bacteria in a reef, as I noted from my careless OD example. I like to be careful to properly label other peoples products since they are all trying to make a buck, both the good suppliers and the shady slippery ones. Have you ever tried to oil a snake? I've seen a few die from spilled petroleum, their skin abosrbs the light ends fairly quickly and they don't tend to live long afterwards, ime.
Lots of GIFsnakes.
