Mapping tank flow

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Delapool

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Feb 7, 2013
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Perth, Australia
Wondering if anyone has mapped tank flow using maybe food dyes or something? I have an idea on the flow direction in upper reaches of tank but no idea what goes on at substrate level (if anything).
 
I did that once a long time ago so this might be out dated. I used sewing thread anchored with a fishing wieght called a split shot. Put them in different locations in tank to see what direction thread would sway. Hope this helps.
 
Thanks for the reply. I'll look into this as I think I still have some split shot in the garage somewhere.
 
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