hello to all,
i have a current tank of 36"x18"x22" and using a Canister Filter of 1200L/H
but still there are a lot of white substance floating around. this might refer to the fine white sand i am using and i want to get rid of the fish droppings at the bottom as the amount get bigger since the fishes grow...
I am thinking about getting either 1 or 2 top filters or a sump cause my tank's stand have a board in the middle for fish food and filter so that will limited the size of the sump.
here's a picture might help explaining what i mean as my english is not very gd.

i have a current tank of 36"x18"x22" and using a Canister Filter of 1200L/H
but still there are a lot of white substance floating around. this might refer to the fine white sand i am using and i want to get rid of the fish droppings at the bottom as the amount get bigger since the fishes grow...
I am thinking about getting either 1 or 2 top filters or a sump cause my tank's stand have a board in the middle for fish food and filter so that will limited the size of the sump.
here's a picture might help explaining what i mean as my english is not very gd.


the poop doesn't go until the hose sucks up a lot of sand.