No problem! Reason I was willing to try by leaving the tads behind is the toads don't hunt below the waterline - when they go under the water they have another eyelid that covers their eye and it seems to severely diminish their seeing/hunting capabilities. When I first added guppies/neons to the set up, for the first hour there was enthusiastic belly flops as they tried to chase them, but they quickly realized their limitations and I have not lost a fish to the frogs to date.

Mine do seem to enjoy the depth - they will dive below to perch in the plants or on the sand bed, sit a few seconds then go back up for a breath. I am really glad this tank is in our living room - I watch them more than the tv!