So my tank is:
45g hex flatback
fluval 404
PH 7.4 everything at 0 except Nitrates which are at 10ppm.
30% water change every 2 weeks, gravel filtered once a month, filter maintained once month, alternating with gravel siphon.
5 super-veil angelfish (very large), 5 black neon tetras, 5 cleaner...