If concrete hurts the water I'll be in a world of hurt. I have several tons of old turkey barn foundation (1'x2'x6-10' lengths) cribbed up in the deep water of my pond. Plus some slabs for artificial bluffs. Plus probably at least 50 concrete blocks for various projects and uses.
Plus I have over the last week used hydrated lime to kill some FA.
So far no dead fish that I know of from it. The minnows and small BG swim in and around the hydrated lime covered algae right after I apply it.
Of course our water tends to be naturally acidic so I figure the lime from the concrete, crushed limestone lining the shore line and other sources can only help.
Could be wrong though.
