The Planted Tank Forum - View Single Post - Black spots on pool filter sand?
View Single Post
post #4 of (permalink) Old 03-24-2018, 06:28 PM
Waltoflorius
Algae Grower
 
Waltoflorius's Avatar
 
PTrader: (0/0%)
Join Date: Mar 2018
Posts: 7
Hydrogen sulfide perhaps?
Waltoflorius is offline  
 
 
For the best viewing experience please update your browser to Google Chrome