Yeah that's a HUGE difference in size an extra 60 gallons! 1 1/2 times the size you originally said! That's why I needed the floorplan. Firemouths could work in there yes. I'm still not sure about oscars though but angels will work, and loads of other fish.
Its great that you have a good size tank. You should still do extensive research to plan the perfect stock learn the nitrogen cycle. Without it, you will only run into problem with your stock, and water.
Ok thanks a lot people, been really good help, an goin back to my rams , one of them have come out in a really nice color, one is still lookin abit dull tho, think I must have bought a bullied one
You could do so much with a tank that size and make it look fantastic! There's a forum on here called 'member's aquariums and fish pictures'. There are loads of pictures of tanks in there for inspiration. Have a browse through the different forums on here too, there's loads of useful information and you'll learn a lot.