I had to add crushed coral as the water is incredibly soft in this area. I also changed my substrate from gravel to sand. I have had diatom problems ever since. Bought some otos that devoured the diatoms but they sadly died. I have four nerite snails but the diatoms are covering the plants quite badly. On some plants its getting hairy on the ends. Looks like dust in the tank. I do rub it best I can when doing a water change. Would adding the fluval clean and clear cartridge to my filter cause any issues. Says it is a resin pad which lowers phosphate and nitrate. Would this cause any harm to fish, snails, plants. Its a well planted tank. Could the diatoms be causing my pH to lower? Its hard finding a balance when I need to buffer the water for a stable pH!