Well the tank is new, been running since december - added the lion last week, the wrasse yesterday. So... There shouldn't be a lot built up, but I know when I put the substrate in, I couldn't see anything for 3-4 days. It was a mixture of dust - pebble sized in the bag - so that could be half the problem.
Not sure if adding a pvc tube full of substrate would work - he stirs it up while hunting... Stirs it up while trying to find a comfy place for a nap... Basically he's constantly hunting around or rolling in it - making it rather difficult to contain.
Andy
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