Well, I was researching online to see what my city (VA Beach) uses for their water utilities. It seems that chlorine is unstable and can ecscape easily. Well, good for me because it won't be a problem changing my water. BUT recently on June 6th of this year, they changed their chlorine which kills like bacteria in pipes and all to Chlormine which is more stable and higher level or somethin like that. WHat should I dO!?? Im planning to clear my tank out today too..