Nicky b, First thing I will say is don't be put off by the perception that they difficult to care for. The main thing is water quality. Start by properly testing your tap water to see what you have, if your water is suitable then that is the biggest hurdle overcome. If it is not suitable, then you need to seriously ask yourself if you want the work required to generate enough quality water. You can't simply plug in an RO unit, as that water will still need adjusting, not to mention that they are quite wasteful systems.
Let's assume that you tap water is OK, fairly soft and acidic, free from nasty chemicals, then the next question do you have 30 minutes spare most days? If yes, then you are looking good.
There are a range of things I could harp on about, but the main one to healthy fish is regular large water changes. So you need a system sorted that will make this as easy as possible for you.....forget buckets and a siphon, that will get old and tiresome very quickly! Mine get 50% water changes every other day, you can get away with less, but if you want them really healthy this is what they will like. Sounds a lot, but it takes me about 15 minutes to do a 400 liter tank.
As for a filter, any decent external will do it. Look to get a capacity to turnover the complete tank volume at least 4 times per hour. They also don't like a lot of water movement, so you need to set the filter up so that the water flow around the tank is gentle.
I could go on all day, but won't
........ Just punt me any questions and I will do my best to help. For me they are great fish, and very rewarding..... so go for it!
Cheers,
Phil