Welcome Waterbug. Why only one predator? If you stock 40 BG this June, by the end of next summer you will have sooo many BG that they will start to stunt and there sure will be no need for a refuge for them, what will they need to hide from? Research a bit about balanced stocking #s. Good luck and enjoy your new hobby.

Do nature a favor, spay/neuter your pets and any weird friends or relatives.