Thanks for the info Byron...
The more I read the more confused I get
OK - here's my tanks issues/status...
As I said, it's a 125gallon tank
My last test results (Feb 20th)
pH: 8
Nitrate: 20
Ammonia: 0
Nitrite: 0
KH: thru the roof? It was high - didn't write it down.
I run 2 Aqua Clear 110 power filters but I'm changing one out for a canister
My lighting is 4 T8 30watt fluorescents (32 inches long each I think), I also have sunlight - I usually have the lights on for about 12 hours.
Since my testing I've added a DIY C02 system which is giving me about 1bps
I was dosing with Flourish twice a week - I've since changed that to daily (divided the weekly dose by 7)
I dose twice a week with Flourish Nitrogen and Phosphorus
I do 30 - 50% weekly water changes.
My sword plants are about 2 weeks in the tank now and are starting to go downhill - black around the edges a little, brown/yellowing leaves, the leaves are kind of 'crispy' to touch. Most of my plants have the black along their edges and from another post I read here I think it might be black algae?? The rocks are also covered in black stuff - it's flat tho so it's not brush algae - unless my flying fox is eating it before it can gro?
Things are looking slightly better since adding the CO2 but the plants are still struggling and I'm just getting more frustrated....