Thanks all!
By the way the fish food I have is 'Ocean Nutrition Bloodworms' and 'Ocean Nutrition Artemia Brine Shrimp.'...so I think they are similar to what you are talking about Truckasauras? They have about 35 cubes of frozen product in each box.
Hmmm,  if I drop one cube in, is there not a risk of over feeding though? Like would they be fat bloaters for ages afterwards and end up getting constipation and eventually swim bladder problems (like Elvis, in the fish world? 

 )
I know I'm going on about this, but its just I had a beautiful betta months and months ago,  a gift from my sister, and I only had him about two days before problems started.
I had been feeding the rest of the tank (6 Cardina tetra at the time) some blood worm, I gave enough to cater for one worm per fish, but this fella was a greedy lad and ate the whole lot before the others got to it...so about 6 blood worms in a row.
The next day he was on his side, not eating, then by a day or two later he was dead. I didn't even have him a week...I was gutted! I'm guessed at the time the cause of death was over feeding.
So, I really don't want that to happen again? 
I only feed my current Betta 2 worms...its easy to control what he gets as he's in on his own.
But, for my bigger tank, are you sure that dropping a whole cube in won't lead to problems? Surely thats loads of food for such a small amount of fish? 
