Is this a valid way to tell how many pods you have?

[EthanHawaii]

I can see a lot of baby pods on the glass where algae is just starting to grow and I'm just wondering if this would be a good way to keep track of the pod population to make sure I have enough pods. Would it work if I think about it like this? If I see the same amount of pods on the glass that means I have enough, and if I stop seeing them on the glass that means there's a deficiency?

Kind of a weird question but thought if this works it would be super convenient!

Thanks,
Ethan