I'm resigned to the fact that I'm going to have to use Red Sea Nano HOBs or something similar on these things (ugh - just go ahead and gouge my eyes out now) because there won't be much of a bioload and flow won't be a serious concern. Sponges are out of the question because of size/scale. Unless someone has other suggestions?
But what the heck am I going to use for heat that isn't 100% obtrusive and hideous? I've got a couple Tetra submersibles but they'll likely be completely gross.
Anyone have suggestions or recommendations? I've been scouring these internets for a couple days on the hunt for solutions.