Wild berry Cake

Germination went well and so did the seedling stage. For a couple weeks I had some issues with deformed growth, yellowing on the tips and slow growth. First time growing indoors and diagnosing issues can be tough. I think the temperature is an issue, however I’m limited on what I can do. My basement isn’t insulated right now so I have a heat mat from AC infinity on the way hoping it will raise the root temp to an adequate level. I think I had my lights to close to the plant so raised it up, and gave the plant a composed tea with molasses and worm castings because I wasn’t sure if the light intensity was causing lock out. I’ve PH my water to between 6.2 and 6.5 so I don’t feel like it’s the problem. The new growth is coming in healthier do something worked