I've had a few flies get in the house this week and hadn't gotten around to killing them with the swatter yet. Well, as I'm doing some maintenance on the tank I find a total of 3 flies dead or dying in the water in 2 different tanks. This doesn't happen often, but it's also not the first time I've seen it. Are they just looking for a drink and somehow slipping in too far? Does this happen to anyone else? I guess there's not much I can do about it other than take them out fast if I find them. Wierd.