Okay, if you're doing this correctly then you just need 3 spawns to finish the bridge. Here's the specifics:
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×Block the bottom row with ROs 1-tile apart when fluff grows, so puff ends up forming there instead, which ROs will conveniently collide onto to form thin ice bridge.
For the first spawn you want 2 puffs to form. Of course, you also want to leave extra ROs so you can do the same for the next two growth cycles. VP will take care of that. However, you don't want too many ROs to be around, so the key thing is to control the amount of ROs to something you can handle until at least the 3rd cycle. You can handle 2 coming for you, and definitely not 3.
It gets fiddly from the 2nd fluff growth but I'm sure you can get the last growth figured out.
[Last edited by uncopy2002 at 11-17-2016 11:47 PM]