i googled "reptile light guard" and one of the hits was ebay. there's a bunch on there and a quick scroll, i found this: https://www.ebay.com/itm/Reptile-Amp...YAAOSwR9pbIN2o per the pictures, it's supposed 15cm which is like 5.9inches (but the descriptions below says 5.12cm :/ ) also they do look like minnow traps lol.
Can you post a pic? I can be pretty crafty with stuff like that at times, but I'm the type of person who needs to see it to be able to figure it out.
Maybe others will have ideas too if they see it?
I turned the cage upside down to make it easier. But easy it is not
I guess I could take the fixtures out and install my rhp if I have to, but I like that it has a fluorescent light installed already for a day/night cycle. I’m making this way harder than it needs to be