how to make a diy frag rack?

[fishissues]

Anybody made frag racks that hold your frags closer to the light i wanna make one of those for my shrooms and other frags but idk how to make them anybody who made them help please or anybody who already knows.

also what exactly do calcium reacters do?

 

[mugg1977]

Never made one, but have seen many. Build a frame out of PVC (open so that it will sink) and zip tie egg crate to the top.
Calcium reactors help to maintain calcium levels, and when used in conjunction with a pH controller, the CO2 form the reactor will help to maintain pH. Others can provide much more information on Ca reactors, as I have never used one.