Any advice appreciated

[martinmcnally]

Tank is 75g I think with prob another at least 10-15 in the sump.

Going to pickup the Mg test kit right now and get a new Alk one while I am at it.

I cleaned the sand bed for the first time the other day took out a lot of yellowish looking gunk along with all the red stuff that was on there. Then yesterday did another water change vacuuming off the rocks (not with the vacuum haha).