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Phyllis
Good day! Please welcome a new "sailor." This is my first time at the aquaforum, so I apologize if something is not right. It has already been five months since I started my mini-reef (30 liters). I have two questions for the forum members: 1. Is it worth keeping a DSB of 6 cm thickness in a 30-liter marine aquarium, or is it better to free up that space for fish? 2. I change the water once a week (5 liters). By the end of the week, a brown film forms on the surface of the water. What is the best way to solve this problem: should I install a skimmer, make a small sump, or increase the water changes? Thank you in advance for your answers.