I just picked up my roughly 4" fahaka yesterday. So far he hasn't eaten at all, how long does it usually take them to get back into the swing of things? I offered him grass shrimp and then a crayfish with no luck. Anyway right now he is in a 55 gallon grow out tank with crushed coral substrate and lava rock and coral rock for decoration. Do you guys think a black or blue background would look better? I would like to post some pics of him, anyone have any digital photo tips for a nikon coolpix 4800? Thanks everyone.