The Fluval 3.0 is definately good enough for low tech in my oppinion, you just need to decide if you want to potentially upgrade to co2 and will have to accept that you can't grow all plants and that they will grow slowly without it. My style is definately low tech no CO2, I can grow carpeting plants (though don't have a carpet), grow red plants etc but they grow slowly and there are many many so called easy plants I simply cannot grow (which is like to!). I have a 90cm 30w light over a 200 litre tank which is 50cm deep.