whats this growing

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17 Jan 2011
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Centurion - Gauteng
Hey guys

Whats this. its "growing" on my back panel,havent touched it but it looks like rock growing on the back panel.kinda like a build up of something. Ive got another spot of the build up and have seen a bit of gha on it. here a crap pic.will try take another one when the lights go on tomorrow.

picture.php
 
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is he maybe talking about the coraline/calcium build up?

that GHA is in your overflow?
 
there is GHA further up, don't know what this is...
looks like the base is coraline but is hard or soft?
 
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