Following up on an earlier idea -
I have a 10 gallon tank that I'm culturing as a potential healthy sandbed transplant for my main tank.
It will surprise no one following the thread that dinos do not live long in a tank that looks like this...
Here's a shot of the tank glass crawling with all kinds of beasties.
https://youtu.be/dgEk2cuWiwg
I put 2 or 3 turkey basters of dino sand/cyano in every day, and by the next day dinos are 80-90% gone.
But it didn't start that way. Over a week ago, when I put the first squirt of dino sand in, 2 days later the dinos had spread slightly, so I have the tank a boost by dumping 200ml of skimmer "green tea" in to see if that helped. Dinos were dramatically reduced 2 days after that.
Still no direct observation of predation on dinos by micro life, but there are lots of candidates in the tank and I will keep watching.