I'm always a fan of long horizontal scapes, like the 6.6 Petco / 12L / 20L, large foot print though.
Lol I don't like changing water! I rarely do, root tabs seem sufficient for macro and fish food for micro. But I'm not doing CO2/high growth. Maybe some day!
Where did you get a TDS meter for $8 shipped? Is it accurate / accounts for temperature?