i was thinking along same lines,i use to run a marina years ago,the bait tanks were cender blocks painted with same as boats,i used baking soda to clean them once a week,you know when water is just right when all the minnows ball up ,when they scatter clean again,same conditions other than shaded with moving air,aint no way for me dig any thing at this house,solid damn rock,took me 3 months to put in a 16 x 24 deck post every 4 ft,then a 50 x 50 14ft fence around it,try hanging wire tight standing on a ladder just dont it can be done but i sure thought my old ass was done for couple times hahahhah 6ft horse wire,the first 6 ft went on top,put i bolts in top of post every post hahaha run rope threw and walked back and forth adjusting to the top couple ratchet straps tighten as you go,only wire to hang tight wire without it being to tight would just bend your poles from weather,so best to go between every post with ratchet strap,the bottom 6ft was a dangerous bitch indeed,about half way up the back side had to cut and adjust to contours of land,fun fun off the bucket list hahahah