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^^^ this
I run 6" net lids with hydroton and 4" grodan blocks. I use about 2" of hydroton in the bottom of the netlid and then place the cube and fill in with hydroton. I will fill the bucket to keep the hydroton submerged but below the Grodan block-that keeps it from wicking solution and prevents stem rot issues. Some folks skip the rockwool and just use hydroton but I like the stability it gives me.
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