Feedback on FH tank setup

[muscle]

RD,

What generally causes hex? If you remember, we talked in another thread about me over feeding. Could that have caused it?

 

[RD.]

Read that thread again, and the links within. Everything about hex/spironucleus is explained in great detail.
It's basically a protozoa that is common in many freshwater species, but can explode in great numbers in a very short period of time when fish come under stress.