How exciting You can (and should) still change the water. I used to just put an old bit of tights over the end of the syphon tube when I was cleaning out fry tanks, that way you'll get out the water but not the fry.
I have a 30l biorb with a grassy type thing round the bubble tube and two big plants. All silk, nothing real. They were in DS's tank (much smaller) but then mine died so I moved the Minnows in mine. They must have like the thing in the middle. This
I was going to do a water change as it's long overdue but I've spotted some fry. Loads of them in fact. And they're so tiny!! I only have 3 White Cloud Minnows and have had them a while so no idea why they've started to breed now.
I really want to change the water now, but daren't in case I suck any up. Plus I need to know what to feed them.