Standard cement will do the trick(rendered)....worked on mine been going strong for years, no leaks/cracks, tiles are an option..(agree with fussy about choosing your own..lol) but they will only go over the top of the cemented sides/base, so save all the extra just go for a smooth finish on the cement, are you digging one out..?
try the fish supply place, have more than just fish..have pumps/feed/equipment and possibly a liner all @ wattana nuwong road.
No liner,No Tiles, blocks and cement., 4 foot deep in the ground.
