[Moved discussion here]
For casing, some of us DIY using PVC air-con trunkings or rain gutters. Check out these discussions:
http://www.aquaticquotient.com/phpbb...;amp;forumID=4
http://www.aquaticquotient.com/phpbb...;amp;forumID=4
http://www.aquaticquotient.com/phpbb...;amp;forumID=4
Or you can get ready-made ones at reasonable prices from Nature Aquarium.
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