I feed once a day a modest amount of one of the following:
- Ocean Nutrition Formula Two (pellets)
- Julian Sprung SeaVeggies (green seaweed)
- OSI Spirulina (flakes)
and every couple of weeks one of these:
- Omega One Marine +garlic (pellets)
- Dainichi Marine FX (pellets)
I change water weekly. I don't know the exact amount because it gets tapped in and out without buckets but I would guess around 1/4th to 1/3rd of the water volume.