Grow Porblems

I am having some issues with my plants could anyone please help. I uploaded some pictures so that you can take a look. They are starting to have some leaves turn, the edges on some are standing up and more. I have done a lot of reading and to what I have read it could be to much salt, not enough watering or to much heat.
I have them in my house at about 75-85 degress at all times. I am keeping them really watered. But I dont know how to check anything else.

Thanks.

looks like tip burn (nute burn). what E.C u feeding them?

I have them all under a 38 Watt 4 foot long flourescent light. It doesnt put out really any heat. I am feeding them Grow Big every 3-4 days or so. This is all I am doing to them. I have the light about 3-4 inches from the tops.

i would look for bugs, thripes or mites.

I would give them less food is all...or add more waterings of just water in between the times you feed the plants.

yeh just lower your feed till bit stronger. should be fine then

if i was you mate id flush with plain PH'd water and use your nute mix @ 2 table spoons per gallon into a spray bottle , mist the plants every other day with the spray and water every other day in between the spraying with the plain water , after 10 days just go back to watering with nutes again and you should see the change

EDIT : if you notice your plants start to droop during this time stop the watering of the plain water and just use the spray until the drooping stops .. hope this helps mate

Transplant in good soil and bigger pots, water with plain water for a week, keep them close to that wimpy light and relax. They will be fine.

See my signature. Keep in mind when they take off growing. Good luck.