Runsoncoffee
Aquarium Advice Regular
- Joined
- Jun 11, 2020
- Messages
- 59
My 75 gallon is a mix of several tanks through out the years. I’m looking to give it a good make over so it looks like it’s all one idea. I’m wanting to switch my current substrate (a mix of everything under the sun, sand, gravel, river rocks) to a mix of black and onyx sand. What would be the best way to do this without hurting the fish or killing off all the good bacteria?