I had a small pot of cactus seedlings from a cactus mix pack (just for the novelty)and i had almost 98% germination.Thats not the weird thing but ill come to that!(lol) all the seedlings were healthy and growing at a good pace.I had them under lights and watered them regularly.After a couple of months i realized that 2 of them are rather unusual.They all got the same treatment yet one stayed red from the germination till its first areoles.I gave the seedling a tag and its firmly rooted,so no root rot.I have the light on 9 hours so its not light stress and the temperature is between 20 and 25 oC and that rules out heat stress.The other seedlings were green (i say 'were' cause i removed then from the pot)and only this one was different.It now grows but veryyyyy slowly...
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and another one that is extreeeemeeelyyy slow,it now has it first spines even though it was the fattest and bigger of the batch.The strange thing its the first growth:
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red tips and yellow center (had to use magnifying glass),pink body and green juvenile ehhh column????

Perhaps they are temperamental?or are they keepers???