The rule of thumb for most people on sumps is "bigger is better". 10g doesnt leave much room for anything. Is your 30g going in a stand? If so, you could fit a larger sump underneath? For example, a 20g long and have plenty of room for a decent skimmer, return section and a fuge.
Wet/dry converted into sump with a Bubble Magus NAC7 cone skimmer, MAG7 return, 200 micron filter socks, Vortech MP40w + two returns for flow. Current Sundial T5 + two retro Icecap T5's (6 bulbs),