WW Seedling HELP

one week old fem ww seedlings are turning purple? Any insight? The cotyledons on 4 of 9 sprouts are purple and now starting on first set true leaves. Growth is slow at best. Other seeds got the same treatment and are doing well. A quick run dow: pro Mix soil, 2 day old water ( to release chlorine) 4" Jiffy pots, Flors T5 2-3 inches away. Day temp around 77-81 night 63-68F. The only thing i can think of is cold temps...I added a heat pad to aide root growth. Can some tell me how they do thier widows? I thought I new how. I grow the free seeds just fine, then i drop a couple $ and now i'm looking at stunted plants. Is there hope:!:
 
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