Slow Growth-19th day/Need your suggestions..

I am going on my 19th day since planting fem. DP Blueberry seeds in happy frog soil, 4 out of 5 seeds made it and have been growing very slow, below is a picture I just took. I made the mistake of starting them off with a 250w hps lamp 18/6 and about 1 week ago after learning of my light mistake I introduced my seedlings to a 17w florecent tube grow light and 2- 23w cfl and eased off the hps. Water ph is 5.5-6, humidity 45-55 & temps between 75-85*.

Now today is pay day and I will be heading out to buy my girls some treats. I need any suggestions as to how I can improve my growing conditions. I know I will have to get more lights so I will be going out to buy 2 floros light bulbs for my 4 ft shop light. I also have to get some nutes, I have been reading around and hear fox farm is good..? I will also need to transfer them into larger pots, any suggestions on the size at this time? This is my first grow and I need any help I can get to get them to grow bigger and healthier as they are growing at a slow pace. Any suggestions will help and am willing to try anything. Thanks!

How old is the plants in the picture...19 days?

Yes, 19 days. Isnt it small? The plant is developing very slowly. What should I do?

First off raise the water ph to 6.8, second put your lights up to 24 hours. Third your leaves are a little yellow by the looks of it which is probably to do with the low ph.

i have the same problem. mine are about the same size and are about three weeks old and i dont know what to do.

I would say that they better perk up soon or they won't imo.I have found to gradually increase pot size rather than a big jump in size.I feel it effected one of my plants again imo.Hope this helps some for ya