ok my pal wants to build a pond suitable told house 7rtcs plus other fish not sure on them atm. space in his garage floor is 8ft x 5ft. so he wants to do it that size and 6ft deep. i suggested breaze blocks so would be really strong. he also wants to put a window at fron too, think 4ft, here was one of my plans. first layers to have blocks flat, then five layers blocks the right way, using about 160 blocks, he thinking of doing blocks flat all way up, oh window to work out too. any ideas are welcome thanks