Newbie looking for advice

I have this raised windowsill that gets a lot of natural light. Ive never had an aquarium before but am fascinated by having a tiny ecosystem and would like to try. Some potential problems though:

* I live alone and am gone for about 6 weeks during the summer. So worried the tank could survive that long especially in the ~30C heat of the summer if i leave the blinds open. Worried about plant overgrowth during that time. Also im gone for 3 weeks in the winter. * Is there no way to add organisms that are herbivores and will eat the plants? So you dont have to trim them * I see people talk about algae as a problem if you get lots of natural light but cant you just dump a bunch of paramecium into the tank to eat the algae?

Thank you for your response