Disclaimer: These are purely my thoughts and I don't have much to back it up at this point but I'd say that the bacteria alone aren't enough to feed the stars until they form a good biofilm which also contains much more than a few strains of those bacteria...imo although some of the strains may be consumable by the stars after forming a biofilm that takes time but they also likely need additional nutrition from other constituents of the natural biofilm (like microscopic organisms besides bacteria). I'd expect it to help some though...I'm not sure how long it takes or how effective bottled bac is at forming digestible biofilms in the first place though since they're added to the water column and have to settle and multiply which takes timeHey thanks for your perspective. By the way, would biofilm eating sea stars like these bottled bacteria as food?