I have kept a bta for two and a half yrs. started out very small, and now about 18 inches in diameter, very healthy. The other day my sump pump stoped working and didnt know that it happen for three days. when i replaced it, it took a couple days for my bta too come back out, and when it did I now have two of them. why do they do this and did this happen because of my pump problem. The water quality is awsome, just lost some of the flow when this happwned. Any info would be great. thank you!