I don't think your plan will work.. It would be very difficult to create a self-sustaining ecosystem with the components you have listed. Likely, no matter the size of the fish you include, the alligator will attempt to eat them which would likely result in injury. Also, every time your alligator defecates the ammonia level in the water will spike. I'm not sure what kind(s) of fish can survive solely off of plant material that would be available in the pet trade, aside from catfish or something. Lastly, why do you want to have only temporary pets? I'm not saying this to offend you, but I'm sure others will agree. If you cannot house an animal as an adult, you shouldn't get it. Get yourself a sexed female dwarf caiman that will not grow exceedingly large. It is unfair on the animal to be constantly traded around. I believe this is a huge problem within the reptile community with several species (monitors, snakes,crocodilians, turtles even). People only want them as babies. Whatever decision you make, good luck with it and be sure to post pictures if you do set something intricate up!

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