WElcome Nitro, and I'm sorry to hear of your husbands' passing. We'll get your plants sorted out right.

First, you should soak the larger RW cubes in water that you have adjusted the pH to right around 6.0 and leave them soaking, adding more pH down if necessary, until the pH remains stable- swish them around to make sure that all the blocks are getting well soaked. Then as you need them, remove them from the soaking solution, rinse, and SHAKE OUT well.

I'm going to move this to Hydroponics where more growers will see it and help you. Why don't you describe your system as best you can, and post up pictures of the setup and plants if you can.

See you in Grow!