Actually the lighting part is wrong if you want to grow corals. I also have a little ten gallon nano which i just recently got up and running. I have adequate lighting in my nano and it wasnt no 70$. It's lighting that I am able to grow most corals too. It's just a 50/50 fluorscent bulbs. I have the ten gallon hood so there two screw in type bulbs. They were about 12.00$ a piece. So its not to expensivetrreherd said:sence nobody else wanted to respond i will
that all depends what do you want to keep?
do you want corals?-If so you will need special lighing($70)
If you only want some fish and a few shrimps than its cheap.
the live rock in a 10 gallon would be 70 bucks if purchased off liveaquaria(thats were i would get it)
The salt would be cheap($40 worth would last you a long time)
No you do not need a certain filter
Oh i see it looks like you stated that you wanted coral. for the pricing on coral you can make it however much you want it to be.
I cant really tell you if its easy or hard because I had it easy and already got cycled water and very expertiese live rock.