Well, I was thinking of getting a new betta tank of two......so I have the tanks now (2 1 gallons), and I am going to save some from walmart today. But I'm too lazy to wait 24 hours. So is it safe just to use my main tank water? I have to clean that tank anyways, so I'll take 15% out from the top, and empty it into the betta bowls. But is this safe? Need quick answers.