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That will definitely happen, I used those for my 120g...I got them from work, we used them to level one of the presses. They turned into a big rusty mess. Maybe you can try painting them first, that should help with the rust.
Speaking of being on a concrete slab...my basement floor is the most...
I felt the same way when I got into the hobby...I loved all the "flowie" stuff and couldn't understand people obession with SPS. Then I got one frag, then two...then three...(you get the idea) and I was really enjoying watching them grow. Depending on the flow & light then take on different...