My thought is if they are used already, the weather would have leached the majority of any nasties out of the pillars already. Good to hear that they are safe from the get go. The distance apart might be dependant on what size of fish you expect to make use of the habitat.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).