What is a fish? An aquatic animal with gills, but what if they decide to climb out of water, which species do this, and why?

Sorry I dove into the science, and I may have gone too far, but there's a fair bit here that you need to know about your tank, and what's going on.

Some fish live in the extremes, so why can't modern day fish start the adaptation to living in warmer waters that dry up seasonally.

We tend to rant about how bad genetic modification is, and these fish are illegal in many countries, but are they the worst thing in the hobby?

You bring a new fish home, is it safe and healthy to go into your tank? How do you prevent an expensive mistake?

BBC Earths' new video on the Impact of Keeping Exotic Fish, under the Dan O'Neill Investigates banner sets out to make fish keeping sound like a dark web trade that is driving species to extinction. Can you imagine my response, well imagine no longer as here are my thoughts, I got a little angry at the end.

Should we all be buying captive-bred fish, or should we be putting wild caught into our tanks? Are we driving fish to extinction, or is captive farms industrial nightmares for fish? The topic isn't straightforward and it is contentious, and as ever I have my opinions.

Are fish considered lucky? What stories do we tell. I couldn't resist heading towards Loch Ness to discuss the fish of legend.

Sorry for the depressing topic, but a bad news day got me thinking. How many people have a plan in case the worst should happen. What happens to your fish if suddenly you can't be there for them.

It's getting expensive in all walks of life, and fish keeping is no exception, here are 5 areas to look at to save money, avoiding buying things you don't need, and wasting money on false economy.