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Hello I have CRS shrimp tank and I have oil film on surface like this, it's too much or can harm shrimps? I think it's can be block oxgen, I'm afraid of that

That surface film can be caused by a number of things. - oils on your hands and arm - the type of food you feed can have high fats and proteins. - too much waste accumulated in the tank and gravel. - not enough filtration that breaks the surface tension. Even an air stone will help here.

Hi @Camarão Urbano, I had to use a translator for this. Your question in English - "Good evening friends. I am not able to find Potassium Carbonate in my country, it is regulated by the Federal Police now. To raise Kh a little bit, I create neocaridins, can I exchange it for another one?" Another way of increasing KH is to use crushed corals or sea shells. -> This is the recommended method. Just start with a handful in a filter bag. You can also raise KH using Seachem's Alkaline Buffer. Dolomite and Aragonite is another way of increasing KH. Aragonite is the crystal form of calcium carbonate (CaCO3). Dolomite rock, sometimes called dolostone, is a calcareous rock made up mostly of calcium, magnesium and carbonate CaMg(CO3). And of course, Bicarb Soda (or Soda ash) can increase KH. Best to use small amounts, so you don't shock the tank. Good luck.

Boa noite amigos. Não estou conseguindo encontrar Carbonato de Potassio no meu país, ele é regulado pela Polícia Federal agora. Para elevar o Kh um pouco, crio neocaridinas, posso trocar por algum outro? Grato