水草情迷

the larger the filter, the better.
if you have visited the filter system of the ocean park, you will discovered that the water volumn uis larger than half of the total volumn. In other words, the water you did not see is more than what you can see.

Another advantage of sump filter is that you can put all the aparatus in the sump filter. you main tank will not see any non=natural items. You just need to hide the water in and water out by background board.