I recently moved the tank across the room, I thought it warrants an update. I also took the opportunity to modify the light stand. Apart from minor difference in arrangement this is how the tank looked like for quite a while.
Looking at the original post date, the tank has been running for more than 18 months. During this I would say I have learned quite a bit regarding plant.
The tank has suffered bouts of neglect, some plants do better than the others. But the only one that does well is submersed anubias nana petite. So I thought, why not made a tank with just it. That would be the ultimate low maintenance tank.
Speaking of low maintenance, the initial goal of have only the fish waste fertilise the plant, has been a catastrophic failure. It seem to work when the only plants in there are submersed anubias nana petite. When having the regular anubias nana, it will always show nutrient deficiency. When I was having it emersed, I could never dose enough N or have enough fish for it not to have yellow tips. Now that it is completely submersed, I have to dose 6ml of Seachem Flourish N weekly, along with P and K. That is more than twice the recommended dosage, I never thought it could happen to a low tech tank.
I suspect it has partly to do with the vigorous surface agitation which provided it with significant CO2 supply. It is the plants that are directly in the path of MaxiJet 1200 (15x turnover per hour) that shows the most nutrient deficiency. I reduced lighting to 7 hours to reduce nutrient consumption. I wonder if reducing flow would reduce nutrient consumption further? Which No dosing is my goal but it doesn't look like it will happen with the plants in there.
While I failed in the low maintenance department, the tank never had any algae problem. I attribute it to the low light and the vigorous flow. There are hints of green brush algae on the centrepiece wood but that's about it. During the tank move I took the opportunity to spot treat Seachem Excel. Some of them has turned pale now.