Thank you for the replies. The pH is fairly high here (7.2-7.6). I will definitely start looking for a smoother substrate.

Hello, I have a 30 gallon planted aquarium with 4 corys, 6 harlequin rasboras, 2 small zebra loaches, and a bristlenose pleco. It is fully cycled, and the ammonia and nitrite levels are at 0. I also do weekly 1/4 water changes. At the start of the summer I had 6 corys instead of 4. The two that died ...