Whats going on ? hi have seen any pics of mhd chages and they are almost always non-verticle but about 2 ft. high and 4 feet wide and all of these owners seem to have sucess so no need to worry of u cant get a 3-4 ft. high cage myn isnt. And dont worry about moving water but try to get moving water with a few days of getting your MHD hope this helps peace out