Don't worry. As long as the fish are under 6 inches, if they do spawn, there's probly not going to be any result. If there is and you're not ready to raise fry, leave the eggs in the tank. Your fish will promptly eat them. If there are ANY left, they will be much easier to care for than fifty. If you think that's cruel, you can try to get another tank, hatch them, and give them to knowledgable friends or good fish stores. Hope this helped.