[Misy]

for a school project we have made a mini ecosystem with potato plant at top, a spider (predator) then flies coming from below where there is the decomposition section of a rotting apple, grass, dirt, then sand and gravel, next is the aquarium with rocks. we want to add a stickleback fish instead of a guppie. do they live longer? if so how long? the water we added has been de chlorinefied w/ a substance and before that we "made it rain" by pouring water through the system. HOW CAN WE KEEP OUR FISH ALIVE THE LONGEST? any suggestions will help. thanks. if you dont know then what type of fish stays alive the longest???