Well if the anubias aren't right for this tank I do have another tank where I could move them to. The other tank was made with low light in mind so that would work. It's shame though, the anubias I have in the high light tank are growing about 2 new leaves per week. The ones in the low tank have 1 leaf in 3 weeks. I might try to place the anubias in the shade of the frogbit first to see if that would solve anything. Otherwise I'll just move them, still need to add some finishing touches to the low light tank anyhow.Based on my own experience I am backing the light, and with your high light requirements you may have to lose the anubias. I have dealt with BBA in 3 tanks where it was only on the anubias. The first I used frogbit which you can see in my signature. The right side of that tank really is very much darker than the left. I had to use a filter on the camera lens for that pic because photoshop could not cope with such a big difference and it was the only way to get a well exposed photo of the whole tank. With the exception of feeding time I always have more fish in the dark half of the tank - their choice. In the other 2 tanks I installed a dimmer and run the lights at 50% intensity. Neither tank has particularly bright lights. 2 of these tanks are on pure RO with only minimal micros.
Just FWIW (what follows is my opinion and I am not telling you what do do)
There is a difference between planted tanks and fish tanks which have plants. The difference is the focus. Those with planted tanks only keep fish to show off their underwater gardens and the well being of the plants is the most important consideration. This may compromise the well being of fish and is the reason I stay away from planted forums. My tanks are all fish tanks with plants for the benefit of my fish. If a plant fails to thrive in ideal conditions for my fish I throw it out and try something that does. One of my tanks has loads of red plants that are almost all green, I'm ok with this because it still looks good and the fish are thriving. I am also not prepared to turn up the lighting because these are all blackwater fish. Once you start injecting CO2, increasing light and adding macro nutrients you are moving into the planted tank realm.
Also FWIW (I spent many years keeping high tech planted tanks) red plants need iron to bring out the red. BBA loves iron.
The fish don't really prefer the shade, they kind of move throughout the tank. I did read that one of the signs of too intense of a light for gouramies was them staying at the bottom but that hasn't been the case either. They do linger at the bottom from time to time to nibble at the plants there or when there is some aggresion among them but I don't know if that is unnatural behaviour?
I have heard that before from some friends. The focus either needs to be on the plants or on the fish, otherwise the other side could suffer. This might sound incredible naive as it comes from someone so new to the hobby but I'd like to go for the balancing act. A good looking, well maintained underwater garden that allows both the fish and the plants to thrive. I think it should be possible if I pick the right plants and fish, or at least ones that have similar needs. I know that I messed up on that one in the tank I currently have.
Well I think iron is included in the nutrient set I bought. It contains 4 bottles but it didn't show every single ingredient on the shop page. This set came recommended by friend so I wanted to give it try.