These condos have a bag of concrete in each bucket. They are very stable and haven't tipped over in 15 years. Next summer I plan on taking a swim with some goggles on to get a look as how they are doing down there.
Going again Saturday. Going to be low 30's in the morning and a high of 49. Water temp was 58 last weekend. Will probably be in the low 50's by this Saturday. Up here in NEOhio.