Here's how i used lava rock to transition from land to water
I never had an issue with separation due to water. My main reason for mentioning water getting behind it is because I always hear "the frogs will never come in contact with it, so I think it will be safe". Water mixing back there with an unsafe substance can cause toxic chemicals to leech into the tank from there.
And that behavior with fbt's is quite common. My son kept several in a palu I built for him and they did that constantly.
Try this link, hopefully it works, there's a video of the steam in the comments section.
https://www.facebook.com/groups/TheH...7026403386969/





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