I would recommend fertilizers Your tank is not established just yet so a little algae is normal. When I start a new tank I do a few things to combat the new tank algae symptoms. Firstly, I have it heavily planted, secondly, I add about 10 ghost shrimp, thirdly, I fertilize as normal, and lastly I use a biological booster.
The goal is simple, to expedite the tanks establishment to a balanced state. You want fertilizer and here's why: Algae are fantastic opportunists. It will take advantage of any imbalance and thrive. This is the reason why it shows up in new tanks. As you know plants need more than a dozen nutrients to grow.
N-P-K-Mg-Ca-S and so on.
Fertilizing your tank ensures the plants have all nutrients available with all nutrients available your plants can photosynthesize and uptake those nutrients. But, if your tank is missing phosphorus but has N, K and the micros that's a problem. It is a problem because your plants will stop uptaking N and K and those micros. Plants require all to photosynthesize. So, those nutrients will sit in the tank. With those plants not competing for those major nutrients they are a free dinner for algae.
Give the plants what they need so they will "suck up" (uptake) the nutrients that would go to algae instead.
I use ghost shrimp because they do a good job of consuming some of the new tank growths (algae, bacterial blooms etc) that occur in a new tank.
My strategy is what you may not expect, I dose well, I give my tank plenty of light and lots and lots of plants, that combined with my ghost shrimp cleaning crew and a biological booster my tank cycles twice as fast with little to no algae.
The plants are growing so quickly and uptaking so many nutrients the algae has a really hard time competing against them.
As a side note that brown algae is normal, they are diatoms and should clear up on their own.
For the reasons above DO NOT use a product that removes a macro nutrient for the plants. In fact, NEVER use it in a planted tank.
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