You shouldn't water every day, thats almost always too much, especially for young plants. Also, don't underestimate how quickly marijuana seedlings root system expands. In less then a week I always have my seedlings in their final pots.
Also, using rapid-rooters to start the seeds will help develop a healthy, fibrous root system quickly. I find it makes for a MUCH stronger, more resilient seedling.
Make sure your soil drains well enough, almost all commercial potting soils need some sand and perlite added to it in order to make it marijuana friendly but you can help your current grow by adding gravel to the bottom of the pot, just enough to cover the drain holes. Your soil should get somewhat dry between waterings. If you are using large pots, a simple moisture meter from a gardening store is a great and inexpensive tool, makes it much easier.
A simple soil recipe is as follows for your next grow:
Pro-Mix or similar NON-fertilized potting soil. NEVER PRE-FERTILIZED!
10% by volume Washed builders Sand (home depot)
10% by volume horticultural Perlite
Fox Farm, "Piece of Mind" Starter Fertilizer (
Plant Starter Fertilizers from Home Harvest Garden Supply ) 2Tsp Per Gallon of soil.
The fox farm starter fertilizer is amazing stuff! Puts lots of microbes into the soil and fertilizes for the first month or so in a way that won't burn your seedlings (unlike most chemical ferts). Plus it's cost effective. I like to buy it from HomeHarvest.com, it's a good reliable small company that doesn't sell it's customer information and has great support.
Remember to add gravel to the bottom, even with a good soil mix it really helps... plus that way you don't have soil pouring out every time you water.
I had 8" seedlings with tones of branches in 7 days with this mix! Hope this helps!