bobby
I like to do bad things.
You should get a ro system. Theres a very good chance your kits are right, however that doesnt mean there not phos or trates in your water. When you have a bad algae problem the algae could be eating the phos and trates up so it doesnt show up on a kit, thats what I would think it is. Macro like chaeto is a ball of algae you dont want to get rid of it it will grow in your sump and eat the bad alges food and eventualy kill the bad. I you want to get rid of the macro just pick it up and throw it out it a ball, However it wont spread from your sump if you keep it there.