W/C's and drop in SG

[Pescador]

A water change is different from topping up evaporation.
Top-up with fresh water because salt doesn't evaporate but water changes are done with pre-made salt water at the right SG and temperature.
You drain a % from the tank and add the same amount of new water.
Try to make any SG changes gradually.

[fishface]

get a refractometer. they're more expensive than hydrometer but one of the best investments for accuracy.

[Jason McK]

A 20% water change with out and salt is insane. If your hydrometer read 1.023 without adding any salt I would have thrown the Hydrometer in the garbage and stopped the water change.

[Aquattro]

you HAVE to add salt to your water change, that's the whole point!! You add water that is the same SG as the tank. And BTW, there is no way RO water was anything higher than SG of 1.000. That is pure water. Your equipment is either way off, or you're doing something terribly wrong...

[Aquattro]

ok, I gotta ask...is there anything alive in this tank??

[Rippin]

Originally Posted by reef_raf

ok, I gotta ask...is there anything alive in this tank??

[bv_reefer]

Originally Posted by reef_raf

ok, I gotta ask...is there anything alive in this tank??

-no theres nothing alive, cause i just love growing cyanobacteria and hair algae for fun..

[bv_reefer]

what ever all my fish and corals are growing great so no complaints so far, mind you i always do little water changes so the SG doesn't even go up or down really, just happened this time because i did a big w/c

[bv_reefer]

ya i've been looking into a used refractometer but honestly i don't think that SG has to be super accurate for coral health as long as it's consistent

[Jason McK]

I give up