Fishman half the crap we buy in this hobby is a waste of money and seriously that stuff work I grow 4 gallon of macro on a 2 week basis with that stuff in my fuge and am talking on my nano system I don't know y it didnt work for but it work for me I don't think 28 bucks is a lot of money i see 1"/1polyp frags of crap for ridiculous amount of $$