I purchased cultures of various pod strains along with "reef soup", a product of aquaculturenurseryfarms.com. Mine is around a 130g system and I used a gallon of the soup along with a couple quarts of pods over the course of a month. I was a bit concerned as they seemed to vanish without a sign as quick as I added them. I'm aware that most are too small to see, but usually some attach to the glass. I was seriously concerned it was all for not until this morning. I only have one Mandarin and one Ruby Red Dragonet, but I'm a big believer in live food for coral and fish so I really wanted a strong population, but this is far more than I expected! Couldn't be happier!