One student emailed about finding ants in his hive already. This problem can be solved simply by getting a kiddy pool, filling it up with water and putting foundation blocks in the center of it. Then set the hive up on the foundation blocks (facing South, of coarse). The ants will drown in your new moat and if you float twigs, moss or wood in the moat, your bees won't drown and besides, now they have their water source closer than ever!!