I have a 60 litre tank (Approx 60 cm L, 28.5 cm W and 36 cm H), pH 8.0, with hard water. I have a Siamese Fighter, 4 Flame Tetras, 4 Silver Tip Tetras and 3 Neon Tetras. There are few very small Apple Snails that don't seem to grow much. The tank is planted light-medium, about 25% coverage...