Unknown Strain

The heatwave finally broke. I can see that the big pot of three plants seem to be stunted. I know now that I should have never put them into the same pot together (8 gallon). Was going to attempt to split them up into separate pots but thought that may do them in so I left them. Still unsure what strains I'm working with but the one appears to be a bit different then the others...it's tall, the others are bushy. Some purple leaves just started showing up on one of the plants...I believe it is a deficiency - I'll be investigating.