My Mbuna was dead when I awoke this morning. Yesterday was acting a bit weird and towards the top. Ammonia 0, Nitrite 0, nitrates 10ppm, PH 7.8, temp 79, weekly water changes, 50 gal with 12 fish, feed north fin veggie, repashy, cucumbers, zucchini, peas. I took a pic. Have no idea how it died...