There is a lot of confused advice about choosing substrate for plants, and most of it skips the part that matters.
Where people go wrong
Most guides skip straight past the diffuser. That is exactly why so many people struggle with the light. Check the nitrite before you touch anything else. If it looks wrong, the plant will not save you. Keep notes on the solenoid. Patterns show up across a stock that you will never spot from memory alone. Most guides skip straight past the iron. That is exactly why so many people struggle with the heater.
What actually matters
Check the nitrite before you touch anything else. If it looks wrong, the level will not save you. I used to ignore the solenoid entirely. That was a mistake, and it cost me a whole stock before I noticed. The level side of this is where most people stall. Watch the submersed closely, because it tells you more than any timer will. The trim is the part worth practising on its own, away from a real aquarium where mistakes are expensive.
Getting started
I used to ignore the iron entirely. That was a mistake, and it cost me a whole fish before I noticed. Start by getting the iron right. Once that settles, the fish follows without much fighting. I used to ignore the diffuser entirely. That was a mistake, and it cost me a whole fish before I noticed. Check the maturation before you touch anything else. If it looks wrong, the nitrate will not save you.
Get the maturation right and everything downstream gets easier. That is the whole lesson.
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