Well, i got some silicone sold at my local aquatic centre & went to a stationary shop & bought some book binders, the plastic ones, then got some plastic mesh which is used for people to practise cross-stich or tapestry on.
1. silcone the binders to the tank either side, measured so they are equal spaces apart for maximum space for each section. leave to dry for 48 hours.
2. then cut the mesh to size & slot down the binders & hey presto, you have your divided sections.
hope that makes sense, really easy to do. but now only thing is, im fully stocked in sections, so my partner says no more boys!!! :( .....maybe one day i'll get a 3rd boys tank...................one day......maybe!!!?! heheheeee, im turning into an aquarium!!! my boys r happy though :)