ACF water height

[devfer]

I am planning on getting a 50 gallon tank and I currently have my frogs in a 20 gallon long tank. I am wondering how high the water should be im the bigger tank becuase they need to go up for air. Or will it be okay to fill the tank all the way up?

 

[RABENA]

You DONT won't them getting tired going up and down 15 18" max

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