Good start, then leaves start to turn brown and curl

A question from a fellow grower:

I am growing my plants in 5 gallons of water using an air stone for oxygenation. The PH is around 5.8 and I am using Ionics grow in the right proportion for the amount of water. Water being changed every 7 days. Lighting is achieved by a Sunleaves Pioneer IV with 4 grow bulbs kept about 10 inches above the plants.

I have started all from seeds placed in rock wool. The problem is the plant start of really well but then the leaves start to turn brown and curl. I am not sure why this is happening. Any help would be greatly appreciated.

Down load the free grow bible an plant care e book an u can compare it to pictures on there an they have lots of interesting information on the two it’ helps me an made me a better beginner indoor grower in just one month it tells u what the problem is an how to fix it

The curling can be from heat , Lights could be to close . Yellowing I the leaves can be to much of nutrients , something is getting a nutrient lock out . You need to download grow bible , and fill out a support ticket .