Brown or diatom algae is usually the result of lighting and nutrients.
If you have the incorrect lighting, you will keep producing unwanted brown or diatom algae.
If you are using a marine salt that is contaminated with unwanted impurities ... no matter how many water changes you make .... this problem will continue.
If you are adding supplements that are made with low grade ingredients, you are adding impurities that will continue this problem.
If you are using a fresh water source to mix your marine salts that contains phosphates, silicates and/or other undesireable ions, this problem will continue.
1) Check your fresh water source. If you are using tap water, consider purified water (RO or RO/DI).
2) If you are using a marine salt that is well known for producing unwanted algae, step up to a better marine salt.
3) If you are using additives, consider the actual need for such supplements. If additives or supplements are deemed necessary, step up to a high purity brand.
4) Advise your lighting system. If you lights are the incorrect color temperature and/or are old, this can be a prime consideration for your current difficulties.
5) Use the SEARCH function on RAG and do some reading regarding unwanted, brown, diatom algae.
6) Without you providing some basic information regarding your aquarium, it is difficult to have others assist you.
E.g. Fresh water source, lighting, marine salt, additives, etc. I.e. You have to help us, so we can help you.
Good luck.
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