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I feed my seedlings kelp and fish mix from biobizz. I really like biobizz. They have a mix of fertilizers that you add to soil for water only. I get gnats so I just use BTI stuff. Microbe lift is cheap per application. $30 for 2000 gallons. You can probably get something similar at Home Depot or a pond store. The pond stuff works just the same gnatrol.