Cleaning box and sponge filters

They collect fine from every tank even those recirculating on the central systems.  By having decentralized biofiltration and solids capture on a central system, any tank can be simply isolated by capping the recirc drain, opening the drain to sewer and shutting off the central water.  Sponge filters are more work to clean but are worth it considering how many solids the trap.

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Box filters are much easier to clean, can be filled with aragonite for buffering and/or lava rock for surface area and are considerably cheaper to replace the media which is chemically inert which sponges are not.