well, assuming you are reading the test results right... (specifically
Ca and
Alk, cause im not sure which brand your using)
do nothing...
continue with weekly or bi weekly water changed until your
Ca and
Alk drop a bit more.
you want your
Ca about 350-425 (IMO) and
alk between 9-12 dKH
your
nitrates really high, so that needs to be addressed. are you feeding too much? what type of filtration are you using...
the sand bed is a little shallow, but im not going to blame everything on that.
water changes will help reduce the
nitrates, but you need to figure out why they are so high after 4 months
