no3po4x redsea help

[urundi]

hi everyone

a friend of mine has been dosing for about 4 months daily 6 ml of that product.

lately overnight corals has been starting to die of. not knowing what is going on he called me, i just got to him 2 hours ago we tested everything and checked everything and it all seems to be in the values that it should and everything seems to work fine.

hes no3 and po4 are zero tested with salifert and with redsea test kit.

my guess would be that this product is killing hes corals due to overdose.

but because i am not familiar with that product i want to ask you guys.

hes aquarium is a 270 liters capacity with sand and live rock already excluded.

 

[Sniperhank]

I've used this product before. I've dosed and accidentally over dosed as well. I haven't seen it kill any corals.
Can you tell us some more about the system? What kind of corals are being affected? Was the product being used as directed and slowly increased in the amount daily? Is there a skimmer on the system?