Re-scaping with aquasoil can definitely cause a spike in nutrients if you're not super careful about it, especially new soil. I would let it settle down, do more frequent water changes and remove what algae you can. If it gets really bad, along with manual removal, an algaecide like Excel will certainly work, especially with a double dose (research that), but it's potent and not for everyone. Some people think it's not worth putting what is basically a hospital cleaning product in their tank. For your biofilm, you can get a surface skimmer like Eheim or others make, which causes very little surface agitation, or you can lift you lily pipes up only when the co2 and lights aren't running. That will clear it up each day without effecting your co2 levels.