Fishing with bottom baits is a widely used and highly effective way of catching carp. But in waters that contain a population of crayfish, it can be a real challenge.
In order to catch tench with boilies, your hookbaits should be between 8mm and 12mm. This dimension also applies to pop-ups for tench, which are buoyant, harder types of boilies. The best boilie flavours for tench are krill, bloodworm and pineapple.