yo kat, i would go with the wavepoint 4x24w out of the ones you showed me. dont worry about your 10g being 20", mine didnt look that bad when i still had the 10g. as for bulbs, i would go with 1 kz superblue, 1 ati blue+, 1 aquascience duo (17500k), 1 kz fiji purple. and if you want even bluer, 1 kz superblue, 1 ati blue, 1 uvl superactinic, 1 kz fiji purple. its really not all that blue, at least in my eyes