Water Gardening: Chlorine & Ponds, 1 by Carolyn22

Carolyn22 wrote:
We had wild frogs once upon a time and then they just ended up disappearing. Not sure if it was about the time the heron visited us or not. We do buy the bullfrog tads every year to keep the koi fry down. You can pick them up for about $1 or so a piece. I wouldn't recommend them though if your fish are small or if you want to encourage the fry.

I would also double check with the local water company to make sure they are not putting any extra types of chemicals in your water. I am not sure about some of the additives to the water, but I do know the filtering works for us.