Some updates on the Sparkster.
Well, the pink ramshorns are barely hanging on but it seems that a pond snail or two laid a clutch. There are tiny baby pond snails ALL OVER THE PLACE. It looks like someone mixed coffee grinds with the sand, that's how many babies there are.

Now I'm starting to wish Sparky ate snails.
All this despite the fact that I'm still struggling to keep Sparky's water at a reasonable temp. Last Saturday it dipped to 70 F. I had to do an emergency water change using about 10 gals of warm water from inside the house to bring it up to about 74 F. I may have to use part inside water for now on even though the inside water goes through a water softener and is ultra soft while the outside water is moderately hard.
And in light of his growing girth, I decided to increase Sparky's food from 6 pellets to 8. He's a growing boy, after all.