Hi, I am currently constructing a fish house and will be adding a tropical pond to it when completed- this will be around 9 x 5 x 3(d). We are toying with building it from brick or maybe even in a mould insitu out of concrete. Either method will be lined with fibre glass and incorporate a viewing window. Has anyone undertaken anything similar or have any ideas/ suggestions? The whole this will be above ground, cheers.