mark7616
potatoes
Also you need to remember that they are not out swimming mine spends all day curled around my filter intake and so does my polkadot eel they only come out to feed and for a little swim for about 10 mins in the evening and because they are so manouverable a 5x2x2 will be fine imo.
, you could get a few bichirs to go with it on the bottom.
jeeeze! considering greens are about £100, i'd have thought silvers would be even more. and i've just never looked into arowanas... ever lol 
