Black beard algae and plants struggling to grow

michaelsf90

I'm going to upload a few pics and try to explain best I can. My main tank is 125L/33 US Gallon. I have several plants and all that ends up happening is diatoms grow. I clean the leaves and they break off. My rabbit snails seem to destroy a lot. I had vallis but they just disturb it and break it off. My java fern was tall but is now growing outwards. Amazon sword growth is slow. Anubias nana has grown well. I have two lights. I usually go with the duller one or else green spot algae starts to grow. I also have black beard algae growing on the edge of some driftwood and on an ornament. Il add pictures. The tank is filtered with an internal Fluval U3. No air pump and no co2. I dose with flourish twice a week

Now my small shrimp tank which is 25L the plants are growing amazing. I added some amazon sword from my big tank which was limp and sorry for itself. It's now large lush and green. Only red cherry shrimp in the tank. Dosed with flourish once a week. Internal filter and no air pump and co2. The light is bright for the size of the tank and i get green spot algae but I clean it off. I need help with the large tank. What will help the plants to grow. The only thing I can think of is co2. I can alter something on the top of the filter which should reduce the amount of air the filter is putting into the water if that would help?
 

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gray_matter16

Will need a little more information to help figure out what might be going on. Can you provide the following for both tanks:

1. Light Duration schedule
2. Water change schedule
3. Nitrate level
4. Phosphate level

Algae is usually a result of an imbalance somewhere between light, nutrients, and co2. But algae doesn't necessarily mean that adding co2 will fix the problem. Maybe it's too much nutrients, or too much light. But need to know more in order to give thoughtful advice.
 
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michaelsf90

The larger tank the light is on for 10 hours. I have a dimmer light which is 5W and a brighter one which is 10W. Both LEDs. The small tank has a 4W LED. Water change every 5 days. Change 20 to 30% of the water. Soft water so both tanks are buffered with crushed coral. Gh is 5 and kh is 2. Ph is buffered in both to 7.2. Nitrate is between 0 and 5 in both. Phosphates is around 3
 
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