As for small tank, dual sponge filter will eat into your tank space. Plus there is no space to put your bio media.
I will recommend a normal hang on filter. Dolphin H80 / Shirbua P60 type. Behind still got space for you to load bio media.
Is your tank fully cycled? If yes, basically 20% for weekly water change will do. Remember to add water conditioner with tap water.
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