The advantage of a thick skull
is that when something does get through it is seen in a shining light. All of the preaching and all of the soap boxing always comes around to this as the Truth...Get the poop out fast.
This is the real reason for no rocks, This is the real reason for bottom drains, aeration in the pond, TPRs, sloped bottoms, and the Coolest Stuff...Vortexes, properly sized for PASSIVE mechanical filtration.
Bio filtration is easiest. All you need is a bare liner, some pipes and a stream in some cases. When you have efficient passive mechanical seperation of wastes which are removed easily and daily, all bioloads are diminished and biofilters can work at peak efficiencies because they are dealing with dissolved wastes not turds.
Mickey the windowman