Or you can just fill in the curvatures of the cork bark with Great Stuff, let it cure, then carve it off flat and adhere it to the background with silicone. It will still bulge out into the tank, but that makes it more interesting.
I've tried setting it curved side down on a hard surface--the cement floor in the shop, and jumping up and down on it to smash it into fittable pieces lengthwise, but I'm rather scrawny, so it just bounced me back up again. Cork bark is resilient to minor assaults. But I think with a manly man type guy with some weight, it might work. When you attached it, it would look a lot less artificial than sawing it into straight pieces, although you'd still have to fill in the gaps, or maybe not. Stuff will grow over the gaps in time.
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Patty
Advice is like kissing: it costs nothing and it's a pleasant thing to do. (George Bernard Shaw)
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