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perhaps you have given them too much heat and not enough light.some seeds need cold to start them off and others heat.you could put the seed tray into a plastic clear bag ,water first and keep in a light place not to hot until they start growing and then re move bag and let them grow slowly in moderate heat and thin out.
i agree with flowering rose they need more light they seem to be reaching upwards what i did was put the tray in a clear plastic bag and put them outside my back door on the floor then its like a mini greenhouse..
Alice, they're struggling for light. Do you have a desk lamp or similar with a bright-ish bulb? I have a couple that I use for seedlings in the depths of winter. Lower the lamp - or raise the seedlings - till the plants are about two inches from the light. They won't burn. Apart from light, the bulb also provides warmth. Raise the lamp - or lower the seedlings - as the plants grow, always keeping them about two inches from the light.
Don't leave them under the light 24/7. Even seedlings need their night time. 12-14 hours out of 24 will be enough.