Assuming you have decent lighting both the rusty and the monti (assume you mean orange monti cap) should be ok.
The rusty is a photosynthetic gorg but it will grow very big and very tall fairly quick so it will be out of the water in a 20L in no time
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Think I would strive for weekly WC's on that tank. ~3 gallons a week will probably serve you well.
The rusty is a photosynthetic gorg but it will grow very big and very tall fairly quick so it will be out of the water in a 20L in no time
Think I would strive for weekly WC's on that tank. ~3 gallons a week will probably serve you well.