Also I just check my PH is through the roof 8.5 can I use baking soda in my IBC system to bring the PH down?
NO Baking soda will raise the pH!!!!!!!
The algae may be causing the pH to rise during the day. If you measure the pH before dawn and again in late afternoon and you see a swing, it is because of the algae.
Do as Vlad said, block the light from the fish tank and see what happens. Have a little patience since it can take a few weeks to kill off algae, make sure you have extra aeration and keep cleaning the pump screen till the algae clears.
a little bit of algae and goop right where the water enters a grow bed isn't that big a problem, However if you are getting algae all over, you need to do as Jon says and lower the flood height so that the top of the media stays dry.
Too much ammonia or nitrite means you don't have enough filtration or circulation through that filtration or you have too many fish for the filtration you have.
Too much nitrate means you need more plants to use up the nitrate from your fish.
The plants don't cycle the tank, Cycling up a system is the term we use when we are talking about establishing the bio-filter bacteria colonies that convert the ammonia (toxic to fish) into nitrite (also toxic to fish) and the nitrite into nitrate (which the plants use). See Aquaponics is more than just plants and fish, the most important part of the whole system is the filtration and the key to filtration is the bacteria. An aquaponics system can be kept going for a time without plants or without fish but it doesn't function at all without the bacteria. Without the bacteria you can only do sterile chemical aquaponics.