Yes unbiased, otherwise I wouldn't have been interested. I'm dosing biodigest and biotim, the reefbooster and Zeospur2. Be careful not to OD on the zeospur!!!
I have dosed 2X now and I can tell. I didn't have a nutrient rich reef to begin with and honestly didn't have any real problems w/my tank, but wanted to accelerate my coral growth and color. I have a lot of what some people classify as 'rare' coral (I just classify it as what the heck was I thinking when I bought it coral because it's crazy high and I'm broke!). I can tell my water clarity is much better, and I haven't had to clean my glass at all since I have starting using it. In the past I had to scrape my glass about every 4 days or so. Things like my tyree PM and pink lemonade, and other various sps's are really seeming to respond and have even better color than I expected, but not because Prodibio is a coral enhancer, but because my water is just so dare much better than I thought I already had. I didn't think it could get much better, but it has, and I'm really impressed. . If you read my current tanks under this post, you can see what I'm running.
My source is a friend of mine out on the West Coast who cherry picks corals and fish, and yes, it's unbiased. He actually used to use Zeo and switched over and dropped me some info and pic's of his setup, so I thought, why not try it hear in the Mid-west (aka the reefing desert). I like to experiment!
Why are you concerned?