Jenny_S wrote:
Hello,

I am starting into the aquarium hobby and was thinking of getting a 20
gallon tank to start off with. However, I have no idea what I need and
what quantities to get.

I will need to get a filter, of course. There are several models, and
from what I can see on the market the ones that hang on the back of the
tank are the least expensive. I have seen what looks like a decent
model: Aquaclear. What do you think? What size would you recommend for
my tank?

Go with aquaclear, and size get one that is minimum for 20 gal getting a
bigger one is not a bad thing, getting a smaller one is a bad idea. IMO
get one that uses sponges a lot less hassle and cheeper. I have on
sponge that is over 5 years old(from previous owner). If it dosent have
a sponge you can get one of a close size and put it in yourself.

To keep the tank water at the right temperature will require a heater.
Again there are so many types and power ratings that it is difficult to
choose without any knowledge. What do you recommend?
Go with a brand name like hagen for 20 gal I would get a 100 watt or better

The bottom of the tank usually has gravel for decoration. How much is
usually put in? The tanks at the store seem to have the gravel height
at about 1", is this height correct. How do I calculate the quantity
that I need to buy?
It's not just for decoration, It roots plants and grows bacteria witch
is needed.

The tank I was looking to but is equipped with a single 15w
flouorescent tube, is this sufficient light for my fish.

Your fish don't care what kind of light, but if you are going to have
live plants now or in the future florecent is the way to go.

I have also been told by the person at the store that I have to set up
my tank with a product called "Cycle" prior to putting in my fish (1
week to be exact). Can someone explain this to me?

Read up on-line, personaly I don't use such products. I get a fish and
throw him in nature will take over and start to cycle, that one fish
might die but it's for a better cause. once the cycle is compleat you
can add more fish without worry.
Anything else that I have overlooked?

Gravel Vac, depending on fish some need hidding spots so orniments or
rock caves.

Good Luck, And enjoy your new addiction

Thanks,

Jenny.