All makes sense. I'm very glad of the helpful replies.
So in considering all this and the responses I got to thinking. As a fishmonger at a premium establishment I have access to a good range of seafood. How much on average would you spend feeding a quality diet, not including pellets or anything? Just I had an idea there might be a little gap in the market. I could put together a range of suitable seafood, like a good little variety enough to provide say two weeks food for the average predatory fishkeeper and post it out frozen to UK residents. Now obviously at this stage I'm just basing things on educated guess work but I reckon I could do a premium package like that for about £25-£30. My question is simple, is it a good idea? Not in terms of quitting my job and getting a mansion but could it be a workable little something on the side? I don't want anyone thinking I'm on here just trying to spam for business, there is no website for me to link, no business, just a little idea.