True. It stays sunk once waterlogged, though since it's lighter than sand/gravel etc, you do get the odd pile on the bottom. I don't mind it in mine, it goes where the current or the swish of a fish tail pushes it. It gives a little more 'life' to the bottom of a tank, and it does stay on the bottom. Again, beneficial in a big tank where you can save a lot of dough, but I wouldn't bother in anything less than 55 gallons.
4/26/2012, lost the finest man. Rest easy Pops...
<--Great Danes are people too!
180g, Fluval FX5, 404, 128watts t-8, low tech, heavily planted, with Albino and reg bristlenose plecs, Congo tetras, Amanos, a herd of Corydoras Sterbai, Boesmanis, a big old common plec, & Otos. 32g tall eclipse3, fluval403, with a handful of bristlenose plecs.
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