Newbie....NZed

Hi
I am new to the newsgroup and have recently purchased a tank.
I have had very little experience with aquariums apart from keeping a couple
of goldfish in a bowl as a child.

We recently purchased a 29lite tank with a build in water filter...carbon
and wool.

When we bought it the lady in the shop said that it could hold the
anticipated 8 goldfish we wanted to purchase.
8 red comets approx 4 to 5cm long.
They have been managing for a month ok. ...so I added a couple of small
blackmores.
A week later I have noticed that they fish look as if they a gulping all the
time. Not enough oxygen in the water ?
I have three oxy weed plants.

I just noticed today also that the comets have red around the gills....not
enough oxygen in the water ?

I also noticed that two of the fish ....dorsel fins are sometimes flat.

Today I did a water change...since a week ago.
I also purchased an airstone.

My questions

1 How many goldfish should I have max for a 29 litre tank ?
2 Now that I have 10 fish ...I am considering getting a bigger tank. What
size tank do you recomend.
3 I have seen a very nice Juwel vision 180 litre tank, which looks very
nice. inbuild filter.
Would it be big enough for the 10 fish and has anyone had any experiences
with the Juwel tanks ie filter systems

Looking forward to your replies.

Regards
NZed



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