Feeding...

Hello,

I'm new to fish keeping. I have 5 inches of tropical fish in a 6 gallon
tank and have been given widely differing advice on feeding from my two
local fish shops. On said a whole 1cm cube of brine shrimp every two
days, another said five flakes of regular fishfood twice a day
supplimented with treats. I know it's important not to feed too much
so I've been erring on the side of caution but my fish are absolutely
rampant for food when I give it. Can any one give me any advice on the
best way to feed them?

(I have 3 pentazona barbs at about 2.5 cm and 2 tiny bagrus type
catfish (ornatus?) at about 1.5 cm - I was advised by my fish shop
that the pentazona barbs would not get bigger than they are, would be
happy in a group of three and were fine for a 6 gallon tank. Having
checked all this on the internet when I got home with the fish I'm not
sure I've been correctly advised. If I've understood it correctly they
need a group of 4 minimum, a large tank because they like to dash about
and they get to be 5 cm. Hmmm I hope they will be OK.)

Thank-you JAZZ