How does one get rid of these borders on a photoshop square based composite, I use screen mode, I try blurs, I've looked it up but I can't seem to blend it in with the background with these borders here.
Is the front image "Itachhii_0-1619561958153.png" available as a layered Photoshop document? If so, have you tried hiding the darker night sky layer?
If it's merged, you'll want to download and install the trial version of Red Giant Universe and apply "uni.Unmult" to your file named "Itachhii_0-1619561958153.png" in After Effects. When insatalled, you'll find it under Effects > RG Universe Utilities > uni.Unmult.