Old school from the 70's is using a hermit crab and feed it daily. More interesting and same results. Took about 6 weeks. Algae came up and it was not nuisance.Not sure if I am being nit picky but to me 'old school' is using a dead shrimp from the butcher or sea food counter to start the cycle. Some also used a smaller live fish. Bottle would be newer. At least this is how I've read the books of old and performed anyway on my first marine cycle in 1999. Probably doesn't matter but after I read this and the old school comment I never once considered or remember reading to dose to 2ppm.