soil fungus

Hi for my recent seeds I used some old compost after supposedly sterilising with boiling water. Im trying to germinate Operculicarya decaryi seeds which need light. Put them in my heated propagator and this fungus keeps growing.
I know it likes the moist warm conditions but is it likely to rot the seeds before they germinate if they ever do?

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That would be ideal - Perlite should work too.
Use just Vermiculite or Perlite that has been soaked (e.g. in a sieve under a tap) then drained.
They need light to germinate, but you can still cover the seed with vermiculite/perlite (so the whole seed is just covered) - light will still get through.
I'd sow them in small pots too - 1 seed to a small pot. Put the pot inside a plastic bag and tie the top. Keep somewhere warm and bight - they can take upto 3 months to germinate. They need to be kept around 25C to germinate.
You'll need to pot them up into normal compost as soon as they're up as the vermiculite/perlite has no nutrients.
Fungi spores are everywhere - some have landed on your sterilized compost and as they have no competition they have started to grow.
Wisdom is not putting it in a fruit salad.
I agree with @Dovefromabove - mixing around half and half helps considerably for anything needing good drainage. I do it for things like Dianthus, although I mainly use Perlite for seeds. It's quite cheap online, and because of it's light weight, the P&P is often nothing, or very low.