Hi!
This is my first question. I'm just a aquarium 3 weeks ans I'm cycling the tank.
I have a 100 liters (28 G). I am using a filter millenium 2000 + gravel biologycal filter (2 sub pumps 180l/h each).
I heard that the goldfish (Kinguio in Brazil, where I'm from!) make a lot of waste and the filtration is very critical.
Did I make a good choice with this filter configuration?
Will I have problems with the gravel filter in the future?
How many Goldfishes can I have in this tank? What size?

Thanks

Kinguio