You may decide not to use a liner, although this will require more frequent cleaning on your part. I used crushed corn cob sprinkled with baking soda in my trays because it traps odors, is absorbent and requires changing less frequently–treated like cat litter, (which can also be used) soiled parts that have clumped together can be easily removed and a small amount of corn cob added to replace what was discarded.
I only recommend using corn cob if the trays are deep enough that the bird cannot reach it with its feet because eating the corn cob is not safe for any bird. Some birds have died from ingesting them.
A large cage door is a must to allow you full access to your bird and it’s furnishings and to make cleaning the inside of the cage easier. Be sure to examine the door latch to ensure that it is “bird-proof”, since many Quakers learn how to open their cage doors rather quickly and must be locked inside to prevent unfortunate accidents.
Another important thing to remember is to offer your Quaker a choice of perching surfaces to maintain optimum foot health. The basic, round dowel perch which is usually supplied with most cages is fine, but should be supplemented with a flat or oval perch in a different diameter.
To provide your Quaker with a surface for beak honing and nail blunting, a concrete bolt-on half perch is an excellent choice, although it will not completely eliminate the need for routine nail trimming. And due to their abrasive surface which may at times cause some foot irritation, concrete perches should not be offered exclusively, but in addition to other perches. Try to use perches that are 1/2” to 3/4″ in diameter except when using concrete perches which should be 1” in diameter for nail grooming to work best.