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Jman, so far the silicone has remained intact. Romanr, that is the original dolomite substrate. I may have added a little but 98% of it was in there when the tank was brackish in the late sixtees or so. I stir it up once or twice a year and use a diatom filter to clean it out. I can't really move the rocks because of the stuff growing on them but very little of them are hitting the bottom.
I build a lot of my rocks and I designed it that way.
Paul
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