I just started using life source a few days ago. I am a believer now. Long story incoming
I started my tank bare bottom with dry rock (will never do that again). I got caught up in the whole biodiversity trend and decided it would be a good idea to start dosing different bottle bacteria's and force the diversity. 1 year later and it has seemed to have a very negative effect on my tank. With stable parameters and regular icp testing I could not grow coral. They stay alive and have good color, just no growth. This is my 10th year in reefing and have had several successful tanks. This was the biggest crap show tank yet.
My theory is by dosing all these bottle bacterias eventually the most aggressive becomes dominant and I believe it is some kind of strain that my corals did not take a liking too. Looking back at my older tanks and the process it always seemed to take a number of months (sometimes only weeks) until I would see sps color up and grow. I can only think this is due to a specific strain(s) of bacteria that eventually dominate and the tank continues on to maturity. Either that strain is not in your typical bottled bacteria or one of those popular brand bottle bacterias contained some kind of aggressive bacteria only good for denitrifying but not necessarily good for coral consumption(coral have only a diet for specific strains and not others?). THIS OF COURSE IS MY THEORY just from what I have witnessed this past year. I have an hunch which brand might have had the bad bacteria.
Another thing I noticed in my tank is that I always had cloudy water for nearly 8 months. Nothing cleared it up including a reef mat, powerful protein skimmer, and even multiple size uv sterilizers. A search seemed to show I mush have been the only person where a UV sterilizer did not help. Adding a few kilos of biomedia was the only thing that seemed to help until the dosing of AF life source.
So this brings me to AF life source. Several days ago I dose the full amount recommended for my tank. The next day water was crystal clear and every single coral was fluffed. Today I am noticing deeper colors in my stagnant sps and have no doubt they are finally on their way to enjoying life. I tried introducing rubble rock and additional pieces of live rock to my system and nothing worked. It seemed it was just not enough to over come the mess I made. AF life source makes sense in my case. Dosing it at regular intervals to get the most natural biodiversity in the mud to dominate seems to work. Even my fish seem to be a lot happier.
I think some might not see a drastic difference because they may not have the same issues I have and already have a very mature beneficial bacteria population in place. I will for sure keep an eye on the progress and try to update.