As stated already I've never seen play sand or PFS in black. Also I've personally never used PFS. I can only find it locally in a brighter white color
I have 2 HOBs running on my 28g bowfront. One of them an Aquaclear has had BGA growing in it and recently started to get quite clogged up with it. I took
Who knows, I'll keep an eye out if anymore pop up.
I don't have a GH testing kit. I just have the freshwater master test kit. Which is ph, high range ph, ammonia, nitrite, and nitrate. And for the plants
The snails are completely black. That is the largest one.