Yes, the standard recommendation for a 1:2 fish tank to biofilter volume ratio is used to prioritize the growth of plants and ensure that they receive adequate nutrients, and to make the most efficient use of water.
If you choose to prioritize fish over plants, then you can adjust the ratio to 1:3 or 1:4. The extra sand biofilters will keep the water cleaner and allow for faster growth of the fish, but due to the larger ratio, nutrient supply to the plants may be insufficient.
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The iAVs Handbook has been updated and this information is covered in Section 8.7. I will update it as I find some more information.
Admin Edited answer 11 February 2025