Bosun:The main spawning should be the 29th Sept to 3th Oct, with a smaller one the month before and after. So may be 31st Aug to 8th Sept you may see something. Watch the sponges during the day for smoke and the corals esp. the boulder corals at night.
We will be in Bonaire late September for the spawning as well.
I'm going to Curacao the first week of Sept with hopes of seeing some spawning. When we were deciding whether to go for the 1st or 2nd spawn, several people told me that first one is the more active one.
Have you been to Curacao during both a first and second spawn week and was your experience that the 2nd one is usually the better of the two? I'm booked so I won't be changing my plans at this point, just curious.