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If I'm reading your post correctly, you a tall, large tank with 28W?? You basically have NO light in your tank. While anubias is low-light, it should be getting at least 1.5 watts per gallon, which means 165 watts for your tank. You also have a tall tank, which means it's even more difficult to get light down to the bottom, where your plants are. In fact, all your lights really are doing are growing algae . . .

Some thoughts:

Get more appropriate lighting (wattage)
Once you get more wattage, get some additional low-light plants, such as java fern, crypts and maybe a few more anubias. You need the plants to "outcompete" the algae for resources.
I definitely would NOT be using Flourish in your current conditions, as it will only be feeding algae. Your anubias are not getting enough light to be able to use the ferts up. You could start with Flourish Excel, though, which has some algae-fighting properties. Definitely use Excel when you increase your lighting. As the lighting increases, the plants will be able to photosynthesize and they'll need the carbon in the Excel to do this. Eventually you might consider pressurized CO2, but may not need it if you stick to low-light plants.
You can remove the algae from the anubias by taking them out of the tank and dipping the affected leaves in a solution of 1 part Excel to 5 parts water. (I believe you can also use a bleach solution, but I've never done this.) The solution will kill the algae. Do not use Excel straight onto the leaves (it will kill the leaves) and don't dip the roots. You can put the anubias directly back into the tank after treatment.

Finally, siamese algae eaters will eat black brush algae and hair algae. As will amano shrimp.

In my opinion, your nitrates are too high, which is also contributing to your algae growth. It's like fertilizer for plants, but since your anubias can't really use it due to the low light, it's helping the algae. My planted tanks are around 5-10 ppm nitrate.

Hope this helps!!
 
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