Seems I have a pair, big one who hangs out in the log has the big spikes on top of the nose. Smaller one who hangs out beside/under the log has a 5 o'clock shadow. They don't seem to be in any big hurry to give me a spawn. Had them for prolly 2 years and nothing to see.
I would say it really depends on how nasty your tap water is. I use RO/DI for my reef to keep phosphate/nitrate down. My discus get straight from the tap. I would use the runoff from my ro/di but don't have space to hide another huge water container.