I bought a plecostamus for a 20 gallon planter that I have as a small pond and it died a couple of days after getting it. Is it possible to have plecostamus as pond fish or do they need to be in an aquarium? I also have about six 1-2 inch goldfish that have done fine for several months in the pond. The only other things I have in the pond it the fountain with no filter and some plastic plants. I live in los Angeles just to give you an idea of the tempurature. thanks for any help