I have a 10 gallon tank that has been running for about two years now. A couple months ago, I upgraded it to high-tech with CO2 injection, and started adding dry ferts (giving EI dosing a shot). My plants have been growing really well for the past month, but now I'm noticing signs of poor growth. I'm not really sure what to make of it and would love your input. My knee jerk reaction is to assume a nutrient deficiency somewhere, but I'm new-ish to high-tech and realize I could be totally off-base, hah.
I am seeing hair and fuzz algae on older leaves (also a bit of BBA on the glass, but it's manageable so far). I have noticed pale new growth in my rotala, which makes me think something to do with iron (?) Sometimes new leaves are stunted as well, but not always. Necrosis in leaves that seems to start in the center, and then move outwards. I saw this more in the rotala, even in newer growth, but now it's starting to impact some of the older leaves on other plants.
Filter is an Aquaclear 30. Light is a Finnex 24/7, on max brightness for 6 hours a day (I had reduced the photoperiod to hopefully help with the algae). Substrate is 50/50 potting soil and SafeTSorb, capped with sand.
Rotala rotundifolia, hygrophila angustifolia, dwarf hairgrass, various crypts
Two sparkling gourami, a few micro rasbora who need more friends, five amano shrimp and some malaysian trumpet snails
I am dosing macronutrients (NPK) and micros (CSM+B) on alternating days, with a 50% water change on Sunday.
4-5 Osmocote+ root tabs that I replace every three months
is now down to 20-30ppm, though it has been quite high (40+) for the last month or so (my fault, I added KNO3 with a target of 30ppm, and forgot that my tap water is already around 10ppm to begin with, whoops). I have been slowly dosing less KNO3, but last week stopped dosing it altogether, and my nitrates have gone down.
I increased K2SO4 until I stopped seeing tiny holes in my plant leaves. Going off of the Rotala Butterfly website, I'm dosing around 37ppm.
Again going off of Rotala Butterfly, each dose of CSM+B gives .27ppm Fe
Currently at 2.5 bps. It comes on 2 hours before the lights turn on, and off 1 hour before the lights go out.
at baseline is 7.5. It is down to 6.9 when the lights turn on, and 6.7 when CO2 turns off.
Link to photo album (which hopefully works)