Hello, I have my 55gal set up with Seachem Flourite Black (amazon link for reference, not the sand kind, the bigger chunkier substrate). When i was washing it it seemed hard and i noticed a few jagged edges. Now laying at the bottom of the tank it doesn't look sharp, my danios like to poke around in it, doesn't seem to scare them. My question is would cories be ok on a substrate like this? From googling i seem to be seeing mixed results, some say it's 100% not an issue, and some say it's not an issue if you have the SAND version. Would love to hear some opinions and especially if anyone has experience with that substrate and keeping cories. Thank you!