My 55 gallon tank has been set up and running and cycled for near 5 months now, and I am at my wits end with it. The brown algae, both diatom and hair is driving me crazy. My plants are not doing well at all. Even my Anubias is starting to get yellow leaves. I know that this is common with new tanks, but since my plants are not doing well, I think I need to do something. I apologize in advance for the long post but I want to include as much info as possible. Here is a plant breakdown
Amazon sword, not sure of the species. It has grown a few new leaves but some of them have turned brown/yellow and had to be trimmed.
ECHINODORUS PARVIFLORUS TROPICA, small sword. No new growth since I got them a few months ago. Leaves are getting algae and some are turning brown/ yellow, even if algae isn't present.
Corkscrew and Jungle Val. Leaves turn yellow/brown and I have to cut them. I do get some new growth, but the same thing happens to the new leaves.
Assorted Cyrpt species. I will get new growth, then the algae takes over and leaves seem wither away.
Anubias not sure of the species. Some leaves have been yellowing, even without algae "attacking" it.
Willow Hygro. Grows well, but as it gets toward the top of the tank, hair algae takes over and I have to cut the leaves.
Aponogeton boivinianus- I have had some growth, but very slow. Just like the Willow hygro, the leaves grow thick with hair algae and I have to cut them.
Dwarf sag. Very little new growth. What little I do get has algae take over.
I had some other species in here, but they didn't do well at all, Giant Hygro, Hygro Compata, Rotalla Rotundfollia.
I have been doing a scaled down EI dosing for low tech, non co2. I have the dry ferts and made 500ml bottle of KNO3, KH2PO4, K2SO4 and 500ml bottle of Plantex CSM+B. I also do 50% water changes on a weekly basis. Fish are 10 Emperor Tetras, 6 Panda cories, and a few ottocinculs. Ammonia, Nitrite and Nitrate are 0. PH 7.8 GH 13 KH 6.
Here is the rest of the tank information
Light-48 in. AquaticLife Dual Lamp T5 HO Freshwater Light with a 48" T5 HO 54W 6K Freshwater Daylight Lamp and 48" T5 HO 54W 650nm Roseate Lamp. It's 20 inches from the substrate. On for 7 hours a day.
Substrate is Eco Complete at a depth of 2-3 inches.
Filtration is Eheim 2217 and AquaClear 70
I am starting to think that it's the light fixture. Could it be too little or too much? I have a 20 gallon long, that has been set up for less time, that is doing so much better. It's running a Finnex Fugeray planted + and has the same water parameters as this 55 and I have zero algae in it and have to trim plants because of growth. I have heard that excess silica could cause algae, but wouldn't all my tanks have the same issue since I am using the same tap water on all of them? Does anyone know if Eco Complete is high in silica? This is the only tank that I am using it in. Again, I know this can happen in new tanks, but I can't help but think there is a "trigger" so to speak that I am not seeing.
Here are a few pics. I just did a %50 water change and cleaning on Friday, and it looks like this already.
Any advice, thoughts, tips would be greatly appreciated.