Wow... I had no idea of the consequences and I'm not new to keeping pets. I want to thank you for the quick and detailed replies. Fortunately, we don't have the heat rock hooked up as it's in the attic at the moment. I've been aiming to get substrate...will do asap. I'll talk to the little boy about perhaps letting the large toads go back on the family farm...if we don't have enough room. We'll separate the toads/tree frog/fire belly. As he's been with them, does he need a stool sample looked at? The toad and he both like to sit in the water. I'm presuming he's captive bred. The tree frog mostly hangs onto the glass until I get him some branches. The bonzai tree is only there for the moment as it is a good source of plant-friendly light. As I wasn't totally certain if toads/frogs needed supplemental lighting, we've had a strip plant light over the tanks. I'll check the forum frequently in case anybody has other suggestions. Thanks again, Steve