new 5ft tank

Hi all I'm after some advice, I've recently got a second hand 5ft shallow tank (60x15x12) 45g and I'm not sure what to do? One of my concerns is filtration and dead spots, in such a long but fairly small tank will I have dead spots and how do I go about preventing this? Does anyone have advice...

I finally have my 5ft tank set up and running and am holding off putting any fish is as the water is still a bit cloudy. I have put new sand in and tap safe and filter start and desperately need to get my larger fish in there as they have outgrown the 128 litre tank. The large fish I need to...