Some advice is definitely needed.
I am currently having a few issues with my office tank and could definitely use some help. A little back story, I've kept reef tanks for almost 20 years but have never done much in the way of fresh water. I decided I would try my hands at a planted tank for my office, but i have had nothing but problems ever since. The tank was set up December 1st ish of 2017. It is a nuvo 8, substrate is ADA Amazonia capped with some generic black sand from petco. For filtration, I am running a bag of Purigen as well as just some polishing floss in the main compartment. The tank is currently stocked with 3 Neons and one Otto (the plan was to add 3 more of each, but the algae is making me wonder if i should or if i should go fishless for a while)... For lighting I am using a 20w 6500K LED flood light as well as a modified Skyye LED (replaced a blue with a red LED). I am also running pressurized CO2 on a separate timer.
Tank Params are as follows:
Temp: 76-78 depending on the day
Ph.: 6.3 steady, although I haven't checked it at night when the lights are off
Phosphates never go higher than around 3ppm and thats usually coming off of a weekend where I can't do the daily water change
The photo period is from 9 am- 6pm and the CO2 is from 8:30- 5:45
My CO2 indicator remains a light green which i presume its too high, but its constant throughout the day. The tank is planted with HC, which is growing quickly, but it stays covered in a stringy brown algae, some Nana Petite, and some Bronze Crypt in the back as well as a Wall of Java moss still waiting to grow in.
Sorry for the long-winded message, but I'm out of Ideas. I do daily 1-2 gallon water changes (no RO/DI although I do have access to it if thats what you suggest) I keep the lighting period short and I feed very minimally. Any ideas?