PVC won't add any nutrients to the water due to decomp..... albeit a few bamboo structures probably won't add that much either.

"Hooks pull out of bamboo easily"......hooks won't stick into pvc in the first place.

PVC structures can be used over and over, and easily moved or repositioned, while organic materials may breakdown and not leave much worth moving.


"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.