GFO
How useful is it? Very. Keeps my nuisance algae at bay (combined with sparse feedings).
Have you seen a vast improvement in the health of your corals and livestock? Yes. Brighter coloration in SPS, no nuisance algae bothering zoas.
Has using media made your life any easier as a reefkeeper? Define easier.... There is additional labor/cost for the reactors/media/electricity for the pump, however my time is worth more to me than if I had to spend my home time scraping algae and worrying.
Do you find the benefit outweighs the cost? Yes, 10x.
Lastly, what application do you use and why. Biopellet Reactor, Fluidized Reactor, Media Bag, etc. I've used it in a bag and in a reactor. I had much better results using a mild tumble of BRS High Capacity GFO in the BRS housing.
Would you recommend this product?