Thanks for all the suggestions. Yes there is some algae; it formed on the peat Jiffy 7 pellets which were probably kept a bit too damp. When I potted them up into the Biobizz Light Mix it hitched a ride. However, this is the case with all of my seedlings and not just these particular ones. I definitely haven't overwatered since potting them up, they have had very little water which has drained through and been emptied out, then the compost left to dry out between waterings.
All my seedlings have been treated exactly the same and all the rest of them look healthy and "normal". They are in the same compost, watered with the same water, under the same lights, everything exactly the same. The only plants that are like this are the Brazilian Ghosts which makes me think the cause is seed-borne and not environmental. No one in the house smokes. The suggestion of a tobacco mosaic type virus is the kind of thing I am worried about because I don't want my other plants to "catch" something from these, if it is a virus. I have a few aphids on the plants now, but there weren't any when the deformed leaves started to form; the plants were free of pests at that stage.
The seeds came from the European Seed Train on this forum but there is no username against them so I don't know who put them in the train, otherwise I would ask them.
Could be overly wet soil and also too much watering, change your watering habits to let the soil dry some before watering again.
Thanks for the suggestion but I'm pretty sure they're not waterlogged. After potting up, I watered them in then didn't water at all until the pots felt light. They are in what will become self-watering pots but at present there is no water in the reservoir because I am aware of the risk of waterlogging. The root growth looks healthy, for the size of the plant - roots just starting to hit the sides of the container.
If you don't yet know what you will like then start with one of each "type" e.g. one scotch bonnet, one habanero, one bhut, one thai, one indian etc. Unless you already know you are very fond of e.g. bonnets, then there's no point in growing every type of bonnet under the sun if that will stop you growing other types of chillies. Try a mix of colours, too, because they do taste different.
1 litre pots are very small; I'd go bigger if you possibly can. Having said that, I did get over 20 pods off my CGN 21500 last year, which was in a pop bottle SWP; it started as a 2 litre bottle then cut in half so the plant can only be 1 litre or less. You need to keep on top of feeding and watering more with small pots because they dry out quicker, hence my use of SWP (self-watering pots.)
I loved this pepper, it's so sweet and juicy with heat slightly above a Hab. I made a mistake of picking my first few pods not quite ripe/mature, IMO for best results you need to wait till the pod colour resembles that of a over-ripe Banana ...when the bright yellow starts to dull a bit.
Bright yellow??? Mine mature from a pale green through a creamy colour to peach. Bright yellow does not enter into the equation.
I'm confused. I thought the Douglah was the (Trinidadian?) name for brown-coloured 7 pots. So a red Douglah is a contradiction in terms - a red Douglah is a red 7 pot. A yellow Douglah is a yellow 7 pot. It has to be brown to be a Douglah.
So by mild, do you mean like a little less than a Jalapeno, or what? Just trying to understand your point of reference.
I took advantage of a Facebook special from Refining Fire Chiles.
I got 2 each of the Sugar Rush varieties and 2 Venezuelan Tiger (8 plants total) for $21.99 shipped. Jim Duffy is good people.
If you're interested, I can set some seeds aside for you at the end of the year.
By mild I do mean a bit less than a Jalapeno, and it did have the sweet taste that they are named for. I have a pretty low heat tolerance (trying and failing to raise it!) and I ate it raw without too much difficulty.
I would absolutely love a few seeds, especially for the cream variety although red would be welcome too, if you can save some from your harvest. This is my first year as a serious chilli grower so I don't have much of interest to swap. However, I am due to visit the Ivory Coast in Africa late in the year so I'll be on the lookout for some interesting local varieties there... might end up with the next big thing everything is scrambling to grow!