I advise against piling against the wall... creates too many "dead flow spots". Instead, why not get a bit creative and build a small diameter pvc frame of what ya want, and wire tie the LR to the frame work? You can create a naturalistic scape with cave and all if that's what you like. IMO, keep as far away as possible from the piling of the rock, though. Insied of the framework could remain hollow... anyway, it may not look super terrific, at first, but with maturity and growth... well, you know.

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