I'm gradually filling my 127 litre tank and have decided my next addition should be a catfish...can anyone recommend which type I should go for? The way i'm planning it he will be living with pristella and cardinal tetras and dwarf gouramis (although all I have at the moment is the pristellas). I don't think I want more than one so he'd have to be a type who likes being a loner, and I wouldn't want him to get too big, what with all the other fish in the tank being pretty small ones, say 5-6 inch max. The tank is 3 feet by 1 with small gravel substrate and I have a perfect hiding place in the form of a broken pot. The tank's only been populated for four weeks so far...