Yes, checking your soil runoff is the best way. Do you have a pet store around? They sell several types of ph testers, both liquid and paper (you dip paper in and check color) that are very inexpensive and can tide you through. They are accurate and cheap and should work for you.

I am thinking ph because you are putting all sorts of things in your soil and they are getting worse and worse right? With several different defs appearing on the same plants it makes one wonder STRONGLY about ph lockout which would make more sense than you not providng several different nutrients to your plants. You can actually add enough things that they start canceling each other out as well.....which will not help your plants either and I think you are getting to a point that you have put just about everything but the kitchen sink in there.

ph testers from your pet store will work fine....BUT NO ph ADJUSTERS from your pet store....way too many salts in them for plants. In a pinch you can use distillled white vinegar to lower your ph and baking soda to raise it (SMALL amounts) :wtf:

If ph is your issue (and I think it is) they should pick up and start growing once you get the problem straightened out. They have lost the time you have spent trying to figure things out but that is not a big deal.....once they start growing again you will be on your way.

You may have to flush your soil once you have checked ph......you've been putting alot of things in it but DEFINITELY check ph first.

good luck.