Struggling seedlings, what are they upset about?

Hey guys,
doing my second auto grow with 4 month old seeds. My first auto experience was a breeze however this year seems to be the exact opposite, no matter what i do to these guys they grow super slowly. They are 5 weeks old and only a couple inches tall. On top of this they seem to have a deficiency now.
They are in 10l pots filled with supersoil and ive been giving them straight water and a light feed of seasol once they had a few sets of leaves. Help would be much appreciated as Im not looking at a very exciting yield at this stage thx guys )

Your already feeding them ......so did they get unhappy after you started feeding........and are you sure your on point with your water. Dry wet cycle

theyve been slow from the start but the leaves did yellow after feeding. Ive been watering every 2 days or so when its sunny

Some of leaves look like water had been standing on them for a bit, do you water the leaves when you water? Acidentally?also they will grow slowly if your temps are too cold. You are growing them indoors this time of year yes? I ask because it looks like they may be outside?

Nute burned leaf tips are seen.

Jimmy Sparkle said:

Some of leaves look like water had been standing on them for a bit, do you water the leaves when you water? Acidentally?also they will grow slowly if your temps are too cold. You are growing them indoors this time of year yes? I ask because it looks like they may be outside?

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Cheers for the replies! yes they are outdoors but temperatures have been pretty warm, the water burns could be a good point though as i try water them in the morning before it gets hot. might have to start doing it in the evenings.