Ok yours is not led. Not sure you DIY skills.
And budget is always a thing. Do have a hood and do you want to keep it? I liked mine.
But you can get kits to fit that hood. I think you need 12 in or so.
A used ai sol would fit in there too. Pull the lenses.
Not sure of your budget either.
A black box led is prob the cheapest but mounts a little high over the tank. No hood I would go SBreeflight for those.
They also offer a nano puck but I don't know the specs. If it would have enough spread.
The small current orbit used or the older version. NO little lenses.
Are pretty cheap on the eBay and two with a controller would give about what the quad cf is.