I have three goldfish in a high 30 gallon aquarium. They are only 2 inches long. Ammonia is 0 Nitrite is 0 Nitrate is 10 I got them from a fair and originally kept them in a bowl. I transferred them to a 10 gallon and then the high 30. Unfortunately I think they got stunted when they were in the bowl. Is it okay to keep them in the 30? They haven't grown much and are only 2 inches.