The heat should not be a problem. Think of a green house, they can get over 100 degrees, but has high humidity.

The pots are a good size and will be fine untill the plant is over a foot tall. They still look like the bottom of the soil is lacking oxygen and staying damp do to the drooping leaves. You should be able to pick those pots up with two fingers before you need to water. Do those pots have decent air holes towards the bottom?

The phosphorus is very high so just becarfull. Phosphorus can be stored by the plant better then N or K. The plant uses the most N then K then P.

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