Can I combine this with my water-cooling setup?

Just give me a 4U tank somewhere where someone else can deal with harvesting the algae and a webcam aimed at it and I can enjoy it just fine from here. For me, selfhosting is mostly about the privacy, not principally about needing to be resistant to loss of Internet connectivity or the like.

I have seen a few guides on growing your own algae including from CodySlab.