A 119-day experiment was conducted at the Asian Institute
of Technology (AIT) near Bangkok, Thailand in a recirculated,
bio-filtered water system using 18 circular tanks
(area 1.75 m2, 50 cm depth) under a roof of galvanized iron
sheets. Water flow was maintained at 8–10 L/min in all the
tanks which were also aerated. Eight concrete bricks were
placed in each tank perpendicularly to the tank wall to provide
nesting sites for broodfish