I guess I will be the voice of opposition on the purple up..STOP using it...if you are doing regular PWCs..(with or without ro
) you are putting enough trace elements back into the tank. The purple up is just overloading your system with more then it needs. It is not as great as your LFS
may have made you think.
The others have given the same advice as I would. You really need, as Kurt said, some good test kits. I use API and have a couple Saliferts too.
Roka, asked a good question, how old are the bulbs in your lights? PC
bulbs should be replaced every 6-8 months IMO