NiceCrits

Another week or two and your SG is good to go!

Did you transplant the rock wool cubes into the clay pebbles or remove the seedling from the cubes?

I'm in Germany as well. I'm about to do my first RWDC run! That's some serious lollipopping! And some serious fans! It looks like you have plenty of space to add some intracanopy lighting. You could add SANLight Flex ii as under canopy or side lights.

Did you make those neoprene inserts to hold the seedlings yourself?

Were their any challenges growing 2 strains in one system?

@Prof_Weed, thanks for the tips! I was thinking about starting with the Athena RDWC parameters. I've got the benefit of a Bluelab Pro Controller Wifi and Tecoponic HY1000, so I should have good fidelity to adjust.

@Prof_Weed, the grow that I am finishing is organic with Biobizz in soil. My next grow will be RDWC with Athena Blended (and I am leaning towards Photoperiods for my first RDWC grow). But I grow with a 1000 watt light and CO2, so I value strains that can handle the temperatures.

@Prof_Weed, true that it is a good strain for higher temperatures.

The breeder notes this plant has a nutrient sensitivity. Did you notice one? Also, it says it is tolerant for high temperatures. It looks like in your environment that is true and it thrived.

I see you're using a CO2 bag. A CO2 controller is 150 EUR and refilling a 10kg tank at Hornbach is 33EUR.

Which strain would you say is growing most vigorously?

@Herikus, I look forward to seeing the progress. It's a good idea to check the PH of the water. Mine is around 7.0 and when I add the Biobizz nutes it raises it to 7.2 Previously, I used citric acid to lower the PH to 6.2-6.3. However, if you're using a reservoir, it doesn't keep the PH lowered very long. Thus I switched to Phosphoric Acid. It's a longer-lasting buffer and also adds nutrients. Good luck!

@Treesus01, I also like their products. However, Fish Mix smells and growing with CO2 in a tent requires adding additional P and a lot more K. I think for my next grow I will go Coco Coir or Hydroponic (which is expensive to do right).

Hallo from Berlin! I have grown a few Medusa F1's, including in CO2 and high PPFD. I am using BioBizz as well. A little bit of light burn on the tips is okay... Your Medusa F1 is yellow at the tips, including the lower nodes. Usually with light burn, it's just the top nodes and they get crispy/brown. This looks like it could be nutrients. Check your soil runoff PH and EC. If you don't have a meter, you can find cheap combo meters on Amazon. If those are in normal range, it's probably a hunger for Potassium. If it is a nutrient problem, don't overreact :-) Fixable.