Ok have had this problem for a few days now and now i need help, have tried everything i can think of.

all water readings are clear except phos levels are black(off the chart).
have cleaned filters and done 40%W/C.
have been using a product called phos-out and am running phos-gaurd in filter aswell.
food i feed is hikari gold, but have only been feeding a min and only every 2days.
I also have a plant in each tank aswell and run air pump in each.

both tanks are 350L identical tanks, identical plants and identical water readings.

tap water reads low phos.

any thoughts, im bout to take the plants out cuz im scared they are the prob as they are not under lights and sum leaves look a bit sad....is this goping to do good or bad???

any ideas dudes???? im stuck.
plants are out. they looking sad.

Its going to be the plants almost for sure, are they in a compost ? I would take them out. Just in case you really don't won't to.
www.pond-products.co.uk/PhosX_18kg.htm