Use a piece of airline and join the 2 ends with an airline joiner. You can also use clear plastic hose from a hardware store, or anything that floats.
Tie a length (10-12 inches) of string to the plastic ring and tie the other end of the string to a suction cup.
Put the suction cup on the glass about half way down. Stick the suction cup to the tank on the opposite end of the filter.
The plants go inside the airline loop and the loop is held at the other end of the tank by the string and suction cup. When you do a water change, the string allows the airline loop to move up and down with the water level.
You can also put a round/ cylindrical sponge from an internal power filter, on the inlet cage of the AquaClear and it will stop plants and small things being sucked into the filter.