Just a little video so you can see the fish, http://www.youtube.com/watch?v=XjLh9Jg07qQ. Having a problem with the small bell syphon I have added in the new flood & drain system. It keeps not working. Seems you have to have just the right amount of water coming into the growing bed? To little & the syphon wont kick in! To much & it wont stop! I’m thinking that the delivery tubes to the NFT will have to be changed as they are rather small & could be blocked up quite easily! As for the fish they are starting to grow recognisably into Tilapia with the head almost dropping down to the front of their bodies.