Looks like he is using potting soil with loam and fish eggs. Yes fish eggs. They are in certain potting soils. Thats the yellowish shiny sort of clear ball you see in the first pic. And the loam is the other white things all over.
Hey Ryan, we had this exact same discussion before, and you were going to research this one. Did you? I can find 0 references to fish eggs in potting soil anywhere, I even called our county extension office master gardeners, a local nursery, and googled this to death. The only answer I can find is that these are timed release fertilizers. I don't want to belabor the point, and maybe they are not harmful to T's, but I'm quite sure they are fertilizer and not fish eggs. As fertilizer, I would have to at acknowledge that there may be a potential to harm a T. Maybe if we knew specific brands of potting soil being used, we could ask the manufacturer for a definitive answer. I can tell you that MiracleGrow potting soil has an MSDS sheet that lists their fertilizer additives including ammonium nitrate, calcium phosphate, ammonium phosphate and potassium sulfate, and warns against ingestion or inhalation, but gives it a pretty low risk level (1) for humans. I think we should be 100% sure that these little spheres are either fish eggs or fertilizer, and whether they are truly harmless, or potentially dangerous. I just want to make sure we're giving accurate info. please note image of Osmocote fertilizer prills (the technical term for fertilizer little bally things) is this what we're seeing? Your humble servant, TonyThat is not fertilizer its fish eggs. Fish eggs and fish products in general are very good for your garden and potting soils. It's not going to do anything to your T, I have used that stuff off and on and never seen a problem.
If he were to pick up that yellowish ball it would pop and have fluid in it. Fertilizer of the time release variety is hard through and through and meant to dissolve over time when exposed to water.