My worry about EI levels and the plant like nature of algae is that I don't have enough fast growing plants to consume the nutrients and "outcompete" the algae. If I increase the fertilisers won't that just make the algae take over the "slower" growing plants?Sounds like your CO2 is fairly well optimised. But stay on top of it and make sure you can rule that out as a potential factor.
The reason, the new tank is relatively immature and missing an essential component to stability; a balanced microbial community throughout the entire system. This helps with plant nutrition, especially in the rhizosphere, and algae control. Your plants will also need time to adjust.
In this instance, the 8hr photoperiod and intensity would have been enough to tip the balance in favour of algae. Reducing the photoperiod to 6hrs is a good start. Reducing the intensity is also a good idea, you're the best judge as to how much would be appropriate.
However, fuzz algae isn't necessarily light dependent but more likely to be dependent on the lack of nutrients, the colour of the floaters and slow growth would seem to corroborate this. In this case your plants will leak nutrients which will attract the algae, hence the reason they're covered. I would think about increasing the dose to EI levels along with the recommended frequent and substantial water changes. You can always back off later once the plants are growing well and the algae is under control.
My other doubt is in regard to nitrogen and phosphates. I would consider my livestock to be a bit on the high side.
14 rummynose
12 ruby tetras
10 corydoras
4 guppies
5 honey gouramis
8 otos
5 hillstream loaches
13 nerites
14 amanos
1000000 cherry shrimps
Dosing high levels of NPK scares me.
Surprisingly the slow growing plants like anubias, java ferns, buces are all growing very fast. Fast growing plants with the exception of h'ra are growing slowly. The alternathera is growing compact and bushy but slowly. Which makes me think light intensity is ok but something from the NPK is lacking and my bet is on the K. I can dose potassium individually but is it likely to cause any problems with the livestock or even through the balance off even more?