Hi all,

I just want to check if I have understood something correctly, it's just
that I have started dosing NPK and I am putting a lot more in than I thought
I would be, well that is a lot more than Seachem recommend...

I am working off (what I think is Tom Barr's ratio) of 15:1:20 and I through
that a level of 15mg/l for Nitrate was too high, so I am keeping my tank at
levels of 7.5:.5:10 being mg/l... I don't know if this is correct to start
with (i just divided everything by 2)

Seachem recommend putting in roughly about 30ml of Potassium a week whereas
I am putting in 40-60mls and most websites I read say Nitrate and Phosphate
should be zero, but I cannot get my Nitrate to drop to zero, it is
constantly at 5mg/l (and i'm bumping it up to 7.5 for the ratio's) But my
Phosphate drops to zero every week...

I am getting great growth and everything was going well until tonight after
my water change I did all my tests and Nitrate was 20mg/l whereas I have
been following the above fertilzation regime that I have been doing for 6
weeks now... When I last tested Nitrate, it was 5mg/l so I added enough
Seachem Nitrogen to bring it up to 7.5 as I have been doing for weeks, but
somehow it has just quite alarmingly... The only thing I can contribute it
to is my Red Tiger Lilly (or is it Lotus...?) has lost two leaves this week
and I have been letting them just rot in the water as I was advised never to
cut their leaves if you want them to flower...

Can anyone tell me if i'm on the right track or if i'm way off?

thank you.

Tank Spec's.
MH lighting
Pressurized CO2
KH3
PH6.8
200litre (approx 40gal)

Justin