Diego21
Aquarium Advice Regular
- Joined
- Jun 15, 2012
- Messages
- 54
Ok I have a weird question, I use pool filter sand for my tanks. I was doing my weekly water changes in my grow out tank today and while I was sucking the crud out I disturbed the substrate and noticed that under the top substrate the sand was starting to turn black! Is this normal? What is it? BTW I have about 45 fry in there about 1/4 in long and one snail.