Don't worry PRW1988, that first photo was from when I first set the tank up and was cycling it. I have a 12 inch airstone and a pump capable of airating a tank 10 times the size of mine. I don't use the airstone at all anymore as the noise from the pump does my head in. And with the number of plants and the movement I've got on the surface from my filter the fish have plenty of oxygen.
jennybugs, I don't actually know what brand the tank is. I got the tank with quite a lot of bits and bobs of eBay from a bloke in Acton. Only paid £60 for the tank, stand, gravel, heater and all sorts of other things. I know the lid is from Peak Aquatics so it's likely the tank is as well. But I do know the dimensions are 90cm x 50cm x 30cm. Which as you can see fits perfectly in the living room.
Regarding the hardness of the water and the rams...I can't remember. I was using the 5 in 1 test strips from API at the time. All I know is that the water was very hard. I must admit I don't do much to "condition" my water when I do a water change except add some API Stress Free. My main concern has always been on keeping the nitrates/nitrites levels good. I'm still a beginner. Perhaps taking some water to your LFS and seeking their advice would be the best thing to do. But they are great fish and if I keep the tank as a community tank then hopefully one day I'll be able to get another pair.