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When I feed solid food to my zebs there is always food to be hoovered up in the morning, but when I feed frozen bloodworm or brineshrimp there isn't a single scrap left in the morning. Now I am sure some gets sucked into the filter, though I do switch off for an hour when I feed it. So now I am wordeing if I am feeding enough. How much frozen should I feed 6 adult zebs?

I think part of the problem is that most frozen foods are actually water which makes it hard to compare amounts. I would suggest you merely cut back some on the "solid" food and increase the amount on the frozens. How much to feed is always a trial and error type thing that involves learning how much of what one's fish will eat.

As a rule I don't turn off filters etc. for feeding. Almost 100% have sponged intakes which enables the fish to get at any food that gets sucked onto the sponge.

I'm just about to move over to an external filter so that will help. They are funny little beggers, I've tried a whole prawn a few times and they barely touch it!