This is the right sub-forum to solve algae problems.
I am looking for fertilization concept because I am not able to find stability yet and I have a lot of problems with algae. I have GSA on the glass and plant leaves + BBA especially around spray bar and skimmer.
I try to test the water and understand what the problem is, but I can't find out.
Here are the details of my aquarium:
144l, 0.9m x 0.4m x 0.4m
Platinum soil (active substrate, it is very similar to Aqua Soil)
2x Chihiros LED 55W, but I reduce the intensity to about 70%, so I use a total of approx 80W (40W+40W), from 11:00am to 9:00pm (10 hours)
yes, I use night shutdown. Turns on 9:30am (an hour and a half before turning on the light) and turns off 10pm (an hour after the light turns off).
ph = 6.7
KH = 9
Fe = 0.15
NO2 = 0
NO3 = 15
dGH = 10
PO4 = 0.05 (but if I measure just after fertilizing the value is approx 0.4), it is because the substrate absorbs phosphorus into itself in about 12 hours (I have tested it)
Easylife Profito: 5ml every other day (https://www.easylife.eu/products/freshwater
Easylife Nitro NO3: 2ml every other day (I add NO3 because without dosing the value in the water is around 5-10, I'm trying to keep it around 15)
Easylife Fosfo PO4: 13ml every other day (other days than Profito) - dose to reach a target 1.5ppm (39ml per week)
Seachem Trace: 2ml every other day (other days than Profito)
Before current fertilizing I try to dose PO4 to reach a target 1 ppm. The situation with GSA was not better. I think there was a better situation with BBA with less PO4. Before dosing PO4 I had only GSA, BBA was not present.
At the end of the week change 1/3 of water. I use 1/2 RO and 1/2 tap water (20l + 20l)
Fertilization story background:
The aquarium is established for about half a year, I have always fertilized only 2ml Easylife Profito. I have had a problem with the GDA for a long time. It gradually disappeared and was replaced by the GSA. After that I added a second light (for support more demanding plants) and started to dose more Easylife Profito and dosing NO3, PO4 and Trace. The GDA has spread more to plants and glass and BBA has been added. I currently have GDA and BBA. If I replace the plants, GSA will very quickly appear on new leaves. I have tried to add more or less PO4 in recent weeks, but this has not affected GSA. I think with smaller doses of PO4 there was only a better situation with BBA.
I've read a lot of articles but I still don't understand why algae attack so much my tank. It seems to me that the water parameters are fine and I do not see a major problem anywhere. Maybe someone more experienced can give me advice?
BBA around spray bar
BBA around skimmer
BBA between glass and Monte carlo
GSA on the glass
GSA on the Lobelia
GSA on the Repens
GSA on the AR mini