Originally Posted by Monkey Magic
sure thing let me know how long it takes for you to see some results and ill do the same
they are now looking better...stupidly, I didn't take pictures to post but they do look better. Not perfect, but the change is noticeable.
I used a cut-up pantyhose and a herb grinder / crusher thing for the shells. I first removed the inner gunk/yolky/egg residue from the shells and boiled them in a pot of water for 10-15 mins. when they had air dried I popped them into the grinder and crushed them up until they were smaller - approx 2ish mm by 2ish mm. I used 6 full eggshells altogether although for larger tanks you could probably use more. I then popped them in my small pantyhose pouch and tied it with plastic tie and popped it right near the plants.
it's taken this long for them to have a thoroughly noticeable change but there's been no drastic swings in my water chemistry or any signs of illness in my fish, and my snail climbs all over it
I'm not saying this is perfect and your mileage may vary but it could be a possibility for you. maybe even replace them after some time for newer ones? I'm not sure. good luck whatever you decide.