Covering seedlings.

Hi when it's 25 > 30+ C° should I continue to cover my seedlings with the transparent lid with air holes to increase the heat and humidity or just let them have raw sunlight
 
No second leaf stage yet although one does seem to have 3 first stage leaves?
 
Images taken yesterday.
 
Thanks.

 

[dave65]

As you can see I have a lot keeping each other company, not sure if that is a good thing. 
 
They seem to be doing ok though.

 

[The_NorthEast_ChileMan]

Looks like I am 8, right down at the bottom of France.
 
Actually, right at the bottom of France you have a little green patch, that is where I am, in the Pyrenees, so I could be zone 7

 
I chose an easy to read map but there are more complex ones that might help nail it down.
 
 
European Hardiness Zones
 
 

 

[dave65]

Lousy summer here so far.
 
Noticed on one of my plants this morning ( Serrano ) some holes in the leaves and also some browning on them ( rust colour ).
 
Any ideas?  Also should I isolate the pot?
 
Hope it's not Covid related, new Serrano strain. 
 
Thanks.

 

[CaneDog]

Bummer about the your weather not cooperating.  Hope it gets going for you.
 
That looks to me like it could be flea beetle or something similar.  I wouldn't be concerned from what I can see.  I probably wouldn't bother with distancing the plant.

 

[dave65]

Thanks.
 
Only wee beastie I can see are tiny flies.
 
There are a lot of them in the pots.
 
I call them fruit flies because I have seen them around a bowl of fruit or a sweet barley beer etc.
 
Not sure what they are or if they are causing the holes?