hi DreadlocK
do you have a filter in your tank?
if you have a filter how do you clean it?
when you clean the tank do you use all fresh water or do a parital water change with dechlorinated tap water
by the way you should be doing a 10%-20% water change every week just to keep the water fresh even if the tank is filtered
your tank size is around 11.88 uk gallons
your water perameters are ammonia, nitrites, nitrates and ph you can buy test kits from any good aquatics shop
do you have any extra air going into the tank?
the food your feeding should be ok but stay away from cheap flake foods
you can feed a pea once a week or even try him on cucumber or lettuce
my fancies dont like cumumber but they love peas
you can even feed brine shrimp or daphnia as a treat