How do you prevent sand from leaking into your fish tanks?

[Admin]

1- The ideal sand for iAVs should be fairly coarse, similar in consistency to table salt or granulated sugar, with virtually no fine particles below 200 microns in diameter. This allows for good drainage while preventing small particles from escaping.

2- Install a physical barrier at the drain points, a small piece of shadecloth, for example, is suitable. A handful of pea gravel may also be used.