Think i may need calcium?
My ludwigia repens (the one that i'm sure that's ludwigia repens) and a few other little plants seem to be having somewhat crinkly leaves. I've heard some places that this is a calcium deficiency.
What can i add to the tank to increase the calcium?
Don't really have money to buy the calcium carbonate in dry form, is there anything that has calcium carbonate in it and that is safe?
I've read using chalk or tums is a good source of calcium. IF it is, would a small pinch full be enough?