I had the same problem when I got mine. The solution came in 2 parts; first be careful not to fill too high or the waterfrom the front of the tank can cascade over the top of the divider into the back bypassing the filter as well as making it easy for fish to swimm into the back, second I went out and got some eggcrate from home depot and glued in a piece the was the entire width of the tank and extended up to meet with the lid. The 2 steps have ended the issue completely.
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Biocube 29 est 05/05/08, Koralia 1, 30lbs live rock, ,yellow tail blue damsel, pair cinnamon clowns, baby snowflake eel,Toadstool , metallic green mushroom, assorted zoos , kenya treen
180gall display, 190 pds live rock, virgate rabbitfish,bluejaw trigger, bubblletip anemone,yellow tang, sailfin tang,melanarus wrasse, cloud wrasse,
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