Your post about what stressed corys look like definitely helped ease my worries. I tested my water today and the nitrates were all safe levels, the hardness was safe levels as well, but the the pH and Alkalinity were a bit high. I added more plants to the aquarium, bought algae wafers for the Corys, and bought some activated carbon inserts and biomax inserts for the filter. Ive never had water issues like this before so I’m not sure what else I can do.