I bought a 20g aquarium online for a planted tank, but it didn't come with a hood. All the hoods I could find cost twice as much as the tank itself. I'm not too concerned about lighting, but my cat is crafty and I'm concerned for the safety of the fish, and I hear ghost shrimp (that I plan on keeping in this tank) have a tendency to jump out. I've already invested over $150cad into this tank set up and I would really like to stay under $200cad, any suggestions for cheaper alternatives to a regular hood?