Welcome to AA
Typically wet/drys use media to house bacteria which would cause your lr
to have less bacteria but not keep it from having any.
1: I'd add another 20 lbs of base or lr
to the tank which will provide all the bio-filtration you need.
2: remove all filter media from your cascade 1000 which will trap waste and build up your no3
3: I see a ph in the photo but it looks like your tank could use a lot more circulation.
4: A 10 gal
fuge sounds great. You only want about 200-300 GPH
flowing through it.
Unless you have a heavy bio-load and/or fish that require pods
I wouldn't bother with a fuge personally.