Hello everyone. I am new to this forum. I recently saw a checkered garter snake in my pond, attacking a frog. When I got close, the snake retreated beneath a paving stone that hangs over the pond. I am not sure how to get rid of it. The pond is enclosed with screen on top and sides with paving stones around the interior. The only place the snake might enter is through a 4"PVC pipe that the electrical cords feed through to the outside. I would appreciate any suggestions. I have koi and have read that snakes eat them. Thank you for any suggestions