Cleaning consists of scooping out any large debris - mainly leaves that somehow get into the tank and then using a venturi device .
When I started up the venturi it was blocked up - on inspection I could see an outlet in the casing was obstructed by a small piece of rock or stick. Using a long length of wire this was pushed clear and it all worked properly after that.
Attached photos of the device - it is attached to a length of timber so it can be moved around easily along the bottom of the tank. Tank photo after cleaning-fish barely visible, 3000lph pond pump and 4 tube aerator and some lettuce leaves also visible. The emergency sump pump/aerator is also in view.
Also photos of the 2 grow beds hooked up to this tank - growing galangal and tumeric ( and nastertium) quite well. I also have another old bathtub attached which has 2 redclaw crawfish in - hope they breed up ok come spring.
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