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I've had two high light co2 injected tanks running for well over a year now and I'm still having problems apparently. Seems I'm still getting signs of a deficiency from somewhere. It's been showing up in ludwigia glandulosa forever but a few recent additions (ammannia gracilis and Pogostemon stellatus 'Broad Leaf') are showing signs also.
Tank stats are as follows
1st is a heavily planted 40gal with 110w cf (8000k bulbs replaced 4/08 ) and 36w t-5 (6700k 8 month old bulbs)
Co2 @ 30ppm as per drop checker using 4dh water. Diffused through a powerhead with the outflow going backwards through a gravel vac.
dosing is 1/4 tsp kno3, 1/16 tsp kh2po4, and 1/16 tsp k2so4 sun/tue/thur. 1/16 tsp csm+b mon/wed/fri. 50% water change weekly. Water is med hard and has a standing ph of 7.6
2nd is a heavily planted 29gal w/110 CF (8000k bulbs replaced 4/08 )
everything else the same as 40 except co2 diffused through a glass diffuser with the outflow under a powerhead. Also kno3 dose is 1/8 tsp.
I was thinking maybe the problem is in my lighting/co2 schedule. Co2 comes on at 11am and shuts off at 8pm. Lights come on at 12pm and off at 10pm. I adjusted co2 to come on at 10pm today thinking maybe the levels aren't high enough when the lights come on.
Maybe something is bottoming out before I reset with the water change? I'm just at a loss.
Any suggestions?
Tank stats are as follows
1st is a heavily planted 40gal with 110w cf (8000k bulbs replaced 4/08 ) and 36w t-5 (6700k 8 month old bulbs)
Co2 @ 30ppm as per drop checker using 4dh water. Diffused through a powerhead with the outflow going backwards through a gravel vac.
dosing is 1/4 tsp kno3, 1/16 tsp kh2po4, and 1/16 tsp k2so4 sun/tue/thur. 1/16 tsp csm+b mon/wed/fri. 50% water change weekly. Water is med hard and has a standing ph of 7.6
2nd is a heavily planted 29gal w/110 CF (8000k bulbs replaced 4/08 )
everything else the same as 40 except co2 diffused through a glass diffuser with the outflow under a powerhead. Also kno3 dose is 1/8 tsp.
I was thinking maybe the problem is in my lighting/co2 schedule. Co2 comes on at 11am and shuts off at 8pm. Lights come on at 12pm and off at 10pm. I adjusted co2 to come on at 10pm today thinking maybe the levels aren't high enough when the lights come on.
Maybe something is bottoming out before I reset with the water change? I'm just at a loss.
Any suggestions?