I have a 35gal tank with 3 fancy goldfish. I've had one since last May and the other 2 I've had for 2 wks. I started out about a yr ago with tropicals but they didn't survive. I have a 15gal tank that I want to try with tropicals again. But I really like the goldfish because of their bright colors. Any ideas for colorful tropicals that would live in a 15gal tank? It was traumatic losing the others, to say the least!