When checking the hives yesterday I noticed that one hive was relatively weak while the other is very strong. There are signs of varroah mite, and the weak hive had a closed bottom board. I have replaced the bottom board with one of the new open meshed bottom boards that I built. I think also that the queen is probably getting old and should be replaced. I noticed one of the cells in the weak hive has been made into a queen cell and there is an egg yesterday, so this will need to be monitored closely. It should be ready in a couple of week's time.