Changed substrate on hystrix

[spotfin]

I like it. They will probably lighten a little.

 

[sponger_2]

how do you feel the hystrix like the gravel compared to the sand?

 

[keepinfish]

how do you feel the hystrix like the gravel compared to the sand?

HA ha, i have no idea. BUT after a day of changing it, they have moved it all to one big pile. They seem to enjoy blowing and moving it around.
I have had sand for them for years, and I REALLY like this gravel. It seems to keep them busy instead of biting each-other. The gravel size is around 1/8 - 3/16" pieces.