Leaves turning yellow and beige spots. Overwattered?

[igm.ig]

Hi,
I use biotabs fertiliser (in the photo) and keep the temperature around 28.5. Humidity is usually at 50 and I watered them every 2 days (around 1l per plant or until it soaks through to the bottom). Now two of the plants started getting beige/brown spots and the leaves strated turning yellow (you can see in the photo as well). Anyone knows how to fix this?
Thanks!

 

[chemistry]

Look a bit over fed to me, box says 5 to 10 plants, how much did you feed them?

 

[Aqua Man]

Fried em with the nutes and now you have a lockout issue. Look like potassium is locked out and that will affect its ability to uptake water.

 

[Aqua Man]

You going to need to flush the crap out of the soil then give them a balanced nutrient at an appropriate concentration

 

[igm.ig]

You going to need to flush the crap out of the soil then give them a balanced nutrient at an appropriate concentration

How much water should I use for a pot with 10l of soil? Or would I have to take out the soil itself? (Sorry, complete beginner here)
Thanks!

 

[Aqua Man]

How much water should I use for a pot with 10l of soil? Or would I have to take out the soil itself? (Sorry, complete beginner here)
Thanks!

I'm on my first soil grow so maybe wait for someone else to tell you how. I'm assuming no ppm or ph meter?

If it was me 30l of temp and ph adjusted water if RO with cal mag. Then a light dose of nutrients. Then let dry well. You may see some deficiencies and shock.

 

[chemistry]

What are you calling soil?

 

[igm.ig]

I'm on my first soil grow so maybe wait for someone else to tell you how. I'm assuming no ppm or ph meter?

If it was me 30l of temp and ph adjusted water if RO with cal mag. Then a light dose of nutrients. Then let dry well. You may see some deficiencies and shock.

Thanks!

 

[igm.ig]

What are you calling soil?

I'm using 70% just normal soil for lemon and Rose. The other 30% are 15% Vermiculite and 15% Agriperlute. (If that's of any use)