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LOL We just added a Forum section to our website... A lot of good discussion going on there too. http://www.spirulinaacademy.com/forum/
you can find the full recipe to grow spirulina herehttp://www.spirulinaacademy.com/how-to-grow-your-own-spirulina-at-home-the-culture-medium/
You should never harvest more than 1/3 of your tank. Always keep 2/3 of the spirulina in your tank so they can grow over and over again and you can keep harvesting it for ever :)You can build a super easy secchi disk with a chopstick and a yogurt container to know how much spirulina you have in your tank. (here is how to do it : http://www.spirulinaacademy.com/how-to-measure-spirulina-density/)