Sounds a lot like the Jobe's fertilizer spikes we have in the US. It's basically all the dry ingredients that you'd find in an all-purpose blend (not sure what is available in the UK, I'm thinking like Gaia Green or Dr Earth in the US), but pressed into a puck for easy application/dosing
I...
That doesn't sound too bad to me, I wonder if maybe 4 gallons is just a bit small for those plants...? I feel like with dry organic blends like Dr Earth you can usually just follow the directions on the bag and be okay, as long as your container is big enough...
You might also wanna start a...
The one on the left looks okay to me, the one on the right looks kinda hungry. Hard to say for sure without knowing what's in your mix and if you've top-dressed since planting them
I would keep it at the lowest setting where you still have negative pressure in the tent, and temperature and humidity stay in a good range. Any faster is not really necessary.
I dunno, I have a slightly smaller tent than you and air gets pulled in the bottom right and exhausted out the top left and back into the room, and I've not run into any issues with that (in a concrete basement no less).
I guess it might depend on how big the room is and how much it's sealed...
This^^^^^ 100% agree about the seal between filter and fan being often overlooked and one reason why people think a carbon filter doesn't eliminate 100% of the smell.
You can probably remove that few inches of ducting and just butt the filter right up against the fan and seal it as best you can...
And a good seal between the filter and the fan. Fan pulling hard enough that no air leaves the tent except through the exhaust, and a good enough seal between the fan and filter that no air can go through the fan without going through the filter first.
I have very little experience with...
100% agree on this. I use the Growbox (similar to Earthbox but the watering/overflow hole is a bit more convenient, imo) and Espoma fertilizers (usually Bio-tone and Tomato-tone).
I'm actually on my 3rd round not dumping out the SIPs, just amending the top few inches of soil, and so far no...
My humble Growbox grow at the mo' - a couple of shishito pepper plants. The one on the left was intentionally planted, the one on the right is a volunteer that popped up during my recent Panama grow. It's been a few years since I grew peppers in there, I guess now is its time to shine
Happy...
Awesome! Yeah I've definitely shared that article a bunch of times. It just makes sense for home growers and isn't that much more work than keeping larger moms (actually possibly less...)