Originally Posted by kevilknc
I'm curious about sand as a substrate as well...I'm thinking about getting a figure 8 puffer and have read that they are brackish fish that enjoy a sand substrate. Will simple play sand suffice? I've thought that perhaps this is too bright of a substrate and will irritate the puffer. Also, how often is it necessary to stir the sand to prevent anaerobic spots?
You have to stir it frequently and after doing water changes.
If you want figure-8 puffers, ensure your tank is large and no fish should be put in there as puffers tend to nip.
You'll need a hydrometer to check the salinity of water.
Juveniles will thrive in freshwater but as they grow, they'll be needing salt conditions to fluorish.
For brackish water, 1.024 should be the salinity measurement.
1.025 for marine.