think it's big enough?

link still doesnt work. I have heard of people putting goldfish in containers that size but if it was me I would probably go with something smaller. just my opinion
 
i think you should put two fancy goldfish in, thats 15 gallons each which is sufficient enough :)
 
If you haven't already bought anything, may I suggest golden white clouds? They color up beautifully outside and do well in small containers.
 
well, I've already got the one gold in a 10g (seriosly, I was shocked when I found out they don't grow to the tank) so I was thinking him and either a school of right clouds or a school of rosy red flathead minnows.
 
This pond would be an Algae factory. There are other types of pop up ponds that are like this but opaque. I would go that route and not this one. If you want to try an experiment, try putting a glass vase outside on your deck for about a week or 2 and see how much alage it collects.
0597902_450_CC_317c1.jpg

* Pop-up pondquarium
* Mini 30-gallon deck pond
* Sets-up in seconds and adds beauty without the hassle of building a full size pond
* Clear vinyl construction for an aquarium feel
* Comes with 60 gph pump
* Accessories not included


Here is a brand that is opaque and comes in 28 gallons and 45.
Pop-Up Ponds from Red Sea Fish pHarm
from $34.99
Product Information:
Place the Pop-Up Pond on your deck or patio to create a beautiful outdoor pond or water garden. Heavy-gauge polypropylene pool is ready to unfold and fill. Includes a submersible pump for aeration. Now you can have the seasonal pond you've always wanted, without the off-season maintenance.

inP036172large_f929.jpg
 
AquariaCentral.com