Sorry for late answer, I just check my messages today.
Thx for the compliment, I'm kinda newbie for planted tank but what is IN flat?
the filter i'm using is Aqueon QuietFlow 10 Power Filter. I think any kind of filter is fine as long as it's has an enough water flow for all plant.
I think you'll be success with your tank. Without CO2 means less selection of plant, that's why i only choose an easy to grow and hardy plant.
Good luck with your second tank.
In my option You have great little aqua.What more we can create IN flat !?
What kind of filter You have on it ?
Im waiting for my nano tank Eheim Liberty 130/till 570Lph(150gph)filter.
I find a place for second aqua ...under 400L/100g tank.There is 'pocket' for 10gallon'er.
We together with NBINC (highest rated tank owner) waiting for a Easy-Life fertilizers from Deutshland aquaristikshop.
I hope to create tank as Yours,without co2 but with 4x8W powerfull bio filtering and fertilizers as Easy-Life ProFito.
Juris from Riga Latvia EU (thanks God no more red USSR)