i redo houses and build alot of stuff with concrete so puring and forming wont be a problem, its the chemicals and coating thats a problem...and also should i have more above ground than below ormore below than above...( 4ft below 3ft above or 3ft below and 4ft above?) or would it jsut be preference?
making it swimmable.... i would like to be able to swimm in it...with the fish

. besides rinsing off in the shower before swimming, what extra filter/chemicals should be added to prevent oils and such from harming the fish? or would there be enough water it really wouldnt matter?