is my substrate good for plants?

[duneshape]

Stratum's fine if you're patient. My Anubias took months to adjust but now it's growing. Maybe just give it time? Also, check for snails, they sometimes nibble weak leaves.

[stellarix]

Yellow leaves could be magnesium deficiency. Are you using a comprehensive fertilizer? Stratum's cation exchange can lock out nutrients if you're not dosing regularly.

[pipedreamer]

I had the same issue. Switched to inert sand and my plants perked up. Stratum's overrated unless you're doing high-tech.