Beautiful. I wish I could get my tank growing this well and looking this clean!
When you first start it's a lot of trial and error to find the correct balance in your tank for growth. Everybody's tank is different so something that works for Joe & John might not work for you. For example, one of the easiest plants to grow in the hobby is staurogyne repens.. It grows in high/low light co2/no co2 yet in my current setup it is one of the only plants i've tried that will not grow right. Even with the abundant amount of information online everyone is going to struggle with something.
For a clean tank you need that balance and maintenance maintenance maintenance.
Looking at your tank I would say focus on water changes/consistent high co2/correct light levels. Also, when starting a fresh scape a couple pointers to avoid algae early on are:
- Large water changes every day for the first week, every second day for the second week, every third day for the third week. You don't have to follow this to a tee but keep up with them early on. This is harder for larger tanks but for nano's it ain't so bad. Once your plants get established(new growth & new roots) you can change the water one or two times a week. You want to do this because in the beginning all those water changes will help remove excess nutrients that your transitioning plants aren't fully utilizing yet.
- Find a light that has the ability to increase/decrease intensity. At the very beginning of your tank, start with a lower intensity and every week boost it by one. For example, my tank is running a Chihiros RGB light that has 10 intensity levels on it's dimmer. The first week I had it at 6, second week 7, third week 8 and so on. Even starting with a lower duration at that start, say 6 hours and every week bump it 15 minutes till you're at 7/8 hours total.