Five gal is a very small change for a 75, 15-20 gal would be more like it. I don't see any reason you could not do it every day for a week if you like (15-20).
Jim
Jim you are absolutely right that 5 gallons is not a lot for a 75, however Mike for your situation I would just do about 10 and let it go for a week. You are not that far off with salinity of ALK to do all that work imo.
I understand believe me.
If you properly acclimated a fish it should be fine as your tank is right now. Some LFS's keep the salt around 1.020 to avoid parasites or something like that.
Not that it is not a good idea to bring it up, I just think it is not a big deal. It would come up to that level with a day or so with no topoff. No need to go changing crazy water.
At the same time have you checked Nitrates? Sometimes they can be high at the end of a cycle where waterchanges will help.
High swings and high nitrate is what can harm inhabitants more than alk or salinity at that level.
When compensating for evaporation, top off with mixed water instead of plain ro/di. Should bring the s/g right up.
I would agree to top off with salt water until it raises. Doing a 10 gallon WC with water at 1.027 would take and enourmous amount of water changes to get it where you need it. Basically, if you do it with the WC method, you are only raising the salinity of 10 gallons of water by .002 which means you are raising the salinity of 75 gallons of water by about .000125. If you add 5 or 10 gallons more than your normal level and let it evaporate, you are getting much more salt into the tank at once (and it is still slow). I've been trying to get my tank back up to normal and it is taking me forever too...I'm up to about 1.022 right now and I've added 5 gallons of 1.027 to my tank over 2 days. I'd say I have another 4-5 gallons to go...
You could add fish now. The salinity is closer now to what you will find in your LFS, than when you raise it to ~ 1.025. Bringing it up 0.001 a day is fine.
Clowns can be a little cranky after being transported. I would look for a clown from some one here or make sure the LFS has had them for a while. It didn't sound like you were going to QT your fish before adding to the display. Be extra careful about any fish that hasn't been in the store for a week or two. Also you might want to figure out what fish you are going to add and start with the least aggressive fish first.
Yeah, I don't have a quarentine started yet, I do have 20g long downstairs, but need some advice on getting one started. I will look on the forums first for some fish...
I also said you could add now, but that is a great move Mike!
What do you want to know about getting it started?
No for sand and rock. Many people just use a piece of PVC for shelter. I have a sponge filter in my sump that sits there until I am ready to use a QT.
I rinse it often so it does not lead to nitrate buildup.
I am not sure how others keep their QT cycled if they do not keep it running, or how they add something to avoid a cycle. I would think you do not want LR from a QT with incoming animals going back to the tank.
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