You can really see how wonderful the plants are going after just 3 weeks of growth. They are quite green and looking pretty good. If you find the leaves are going a little brown or yellowing add a little chelated iron. If you have some bug problem, firstly make sure you use the companion planting idea. If it is caterpillars that are your problem....they loved the bok choy....you can use Dipel but it only affects caterpillars in the moth and butterfly family. It won't harm any other organism and has long been a favourite of organic gardeners and commercial growers. And better still, when applied to food crops Dipel has no withholding period: vegies, fruit and salad ingredients can be washed and eaten immediately after spraying and does not kill the fish. The other fix is to pick the pick the offender off and feed to the fish.