I bought a Geophagus Surinamensis on Saturday. Its now Wednesday and I haven't seen it eat. It looks and acts fine. No hiding or aggression and has its dorsal fin up so doesn't appear too stressed or scared. It follows my severum around and they almost seem to be playing. The aquarium is 120G and there is the Geo, a Red Serverum, an Electric Blue Acara, 4 Bolivian Rams and a Bristlenose Pleco. All the other fish are absolutely fine eating and growing well. I have tried all sorts of different foods but the Geo simply wont swim down to the sand to take them. The ammonia and nitrite are at zero but the nitrates are in the red but little I can do about that due to my tap supply. I am treating the water for a fungal infection on the Severum but that has now cleared up and only have one more dose to go (I want to complete the whole treatment schedule). I know Geos often do better in groups but I also know of people who have kept them singly with no issues. Is this likely to be the Geo just settling in or is there likely to be a deeper issue? Could he be eating without me noticing? How long can he go without food? I have some alternative sinking pellets arriving today but at something of a loss as to what to do with him.