I think between the gold nugget and blue phantom, the phantom is more likely to come out from under the driftwood. They both typically hang out in the driftwood "cave" or hanging upside underneath. When the blue moonlight is on or all lights off (even during the day) the phantom typically cruises around more. At least this is what I've observed with mine.
Convict360, I typically poor in a small cup that I always use when dosing Prime, Stability, etc. This just decreases my chances of overdosing. I've done it enough where I use the lines on the cup and know how much I need to pour. It helps if you've got someone nagging in your ears