Is this a case of too little Co2?
I Started my tank mid December. Here are the particulars:
I have a 40 Gallon breeder with Eco Complete substrate.
Lighting is a fluval plant and fresh 2
2 aqueon quiet flow 30 filters,
plants are crypts, anubias, water sprite, valisneria, swords, red star ludwigia, a marimo moss ball, dwarf sagittaria, bacopa australis and a bit of cabomba and they seem to be doing just ok
Fish/Inverts are 5 black neons, 1 juvenile koi angel, 2 otos, 3 cory, and about 10 nerite snails
lights are on for 5 hours
CO2 comes on 1.5 hours before the lights and shuts off an hour before.
I'm doing EI dosing with macros and Flourish liquid and tabs as micros.
40-50% water change weekly
water parameters are 0,0,20
ph is 6.3 with CO2, 7.6 without
kh is 3 gdh
phosphate is off the charts but I expect that with EI
temp is 76-78
I was hoping that at this point I might see diatoms gone and minimal algae but the algae growth is picking up. It looks like brown hair algae. In addition there are quite a few hydra in there which means there's something there for them to eat.
I have read so many times that nutrients in the water column are NOT the cause for algae growth and that Insufficient planting, too much light and too little Co2 are the points to consider.
I'm unable to post attachments yet so I can't add a photo to illustrate plant density. But lets assume its enough. Do the stats I gave above strike any of you as potential algae causes?
Given the pH drop I see with CO2 I'm guessing I'm reaching a sufficient concentration but I suspect I don't reach it soon enough My concern is that it will reach too high a level while I'm not here to correct it so I'm hesitant to crank up the output much more. I'm using a glass/ceramic diffuser fed by a 5lb tank through a regulator with output pressure at 20psi. Bubble count, if that's useful, is too fast for me to count but I guestimate 10/sec.
Any ideas? Does it sound like I'm being too conservative with CO2? Should CO2 concentration already be at its max when the lights come on? Does Pearling indicate level of CO2?
So many questions!