Since you live in Scotland peat should be in no short supply so try your hand at a blackwater South American biotope. Pick a river system reasearch the fauna and give it a shot. That's somthing you don't see every day.
I'm with Justin best of both worlds has always worked for me , once you've found a balance of fish that works it can be very rewarding
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I've kept 5 native trout over a year in my 160 with nothing but sponge filters.
No lights no heat.
Was cool I new I wasn't going to live at that place long and didn't want to invest in fish so I caught them out of a creek on worms and a hook.
Trick with trout is a current and cold water. All my sponge filters were at one end of the tank that caused the water to roll from one end to the other it was a slight current. and that's all they need.
that was 2001 after the 1st wife but before I bought my new house and was renting.
Rich