about 20+ ys ago :oops:
i first built a sump as the bigger canister filters on the market had to be imported and were very expensive
built a few in drums then first glass one one was an old 3 foot tank with plenty of baffles and full of pumice, from large to smaller as it ran through the filter
had a low flow rate pump set up on it
tank had onder gravel filter plates, lots of plants and 8 large discus
tank ran perfecly no problems
i hve been reading a few articles on different bacterias present in tanks and they optimum they work at
i too want to build a sump incorporating both aerobic and anaerobic components
been contemplating potting a deep gravel bed in to see how it functions