Swing arm standpipe with slotted pipe in bottom skimming/flooded suction mode. The tub in this configuration is on recirculating flow but the volume/water level is dependent on the sump level and all but about 4 inches of this tank can be considered sump volume. The slotted pipe collects debris from the bottom. Rotate the arm up for slotted pipe surface skimming. Remove the pipe and rotate the last elbow up for thin film surface skimming or better yet install the #goldfishgaragesurfaceskimmer #goldfishgarageprotip #goldfishgaragediy #aquaculture #aquacultureengineering #goldfish #goldfishbreeder #goldfishkeepers

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