In my opinion I would go with a pair of neon gobies (blue is my preferred color) over the clown or watchmen goby. They are fun to watch, keep ich under control at their cleaner station & are practically invisible to your bio-load. Mine eats frozen brine right off my hand, it kinda tickles. If you do, make sure to get the store to have them paired up because two males may fight to the death.
All the best.
All the best.