Roan Art said:If you do a fishy cycle, then the bacteria only develops to support the fish in the cycle, no? Everytime you add a fish or two, the bacteria has to expand to meet the needs of those fish and there's always a chance of a spike, large or small, while that happens?
Is there anyway to cultivate a particular size bacteria colony? Or predict just how many fish your cycle will support?
Fishless cycling is a method of growing the largest possible biofilter for your tank. If you are working with ~4ppm ammonia in your tank, you are developing a large enough biofilter to add the maximum number of fish to your tank immediately afterwards. If, after you are done the cycle, you only add a couple of fish then your biofilter will adjust to support only that number of fish (ie some bacteria will die off due to lack of food). Any additions after that would cause the biofilter to grow again, and could cause a spike just as with the traditional method of fishy cycling and adding fish a few at a time.