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I pulled 2L out and added the f/2 on the 11th. I didn’t add any f/2 to the ten gallon tank. Here are some pictures now.It looks like you're crushing it for a first attempt. My first attempt failed miserably!
When you compare Day 1 to Today, I'm sure you can see the difference & you are infact growing phyto. The used filter floss & the fact that you started with tank water that already contained nutrients, combined with sunlight, has provided sufficient source materials for you to get this far. Well done.
The deep green comes from the ratio of dense phyto to water, fertilizer, sunlight & time. We're following the recipe pretty close although we're not using 1:1 water to phyto but 2:1. We split the culture every 7 days. We are trying to get to the end result of outdoor culturing a little quicker because we are feeding ~425 gallons (100ml / day), & buying dead cultures is expensive at this volume. So far, it's proven to be pretty successful.
When your F2 arrives, I would grab another 2L container, pull out that volume from our 10gal & add the required amount of fertilizer. Ideally you might have another 10gal tank or open plastic tub. Allow this to sit next to your current culture & take a picture around the same time every day. When your control starts to turn lighter, it has consumed all nutrients & you will need to add fertilizer. If your fertilized sample starts growing darker, than you'll know you're on the right track. Once it's deep green, pull out 2L & keep it in the fridge as a backup in the event the culture fails. It should last 30-45 days.
My $.02 anyway. I'm also very new to the culturing game but I have studied the topic a decent amount.