The water bottle method……..didn’t work lol. Because I made a mistake. Cleaned water before adding to bottle and then when I used the funnel, it got really clogged. And I didn’t get anything in there. So I just got a plastic bowl (if you don’t want cloudy water do not attempt 🙃) and put clean sand in, put bowl in very very slowly. But when I poured even as slow as I did, there was some serious cloudiness 😐. It got down there and it worked but the cloudiness, oh yeah it was cloudy. Ok I need to stop using the word cloudy 🤣. Anyway the water is u know cloudy but it worked! Here is a picture. And comparison of when the tank was setup, vs now.
before adding more sand.
And after.