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What specific gravity do you like to keep your saltwater tank?
Posted on 9/22/26 at 12:25 pm
Posted on 9/22/26 at 12:25 pm
I've done freshwater aquariums for years. I've been doing a lot of reading and youtube watching preparing to set up a saltwater tank. Since I've used copper sulfate in the past, and that is not compatible with invertebrates, I tore down my 75 gallon cichlid tank, sold it on market place and set up a brand new 75 gallon I picked up at Petco (Currently 50% off all tanks at Petco).
Anyway, I keep seeing 1.026 specific gravity or 35 PPT. However, when researching different fish the specific gravity varies on different species from 1.020 to 1.026. Is it that big of a deal or difference? Why is the recommended specific gravity on the high end of the target range?
If you have a saltwater tank, what specific gravity do you keep your tank?
Anyway, I keep seeing 1.026 specific gravity or 35 PPT. However, when researching different fish the specific gravity varies on different species from 1.020 to 1.026. Is it that big of a deal or difference? Why is the recommended specific gravity on the high end of the target range?
If you have a saltwater tank, what specific gravity do you keep your tank?
Posted on 9/22/26 at 12:27 pm to Clyde Tipton
1.024
Edit to Add:
Nano - Mixed Reef
Edit to Add:
Nano - Mixed Reef
This post was edited on 9/22/26 at 12:29 pm
Posted on 9/22/26 at 12:27 pm to Clyde Tipton
Do you run an S&W test on your tank regularly and clean it out with Varsal?
Posted on 9/22/26 at 12:39 pm to Clyde Tipton
Generally around 1.024. But I've never been hyper vigilant about it... Letting it drift a bit here and there won't hurt.
Reasoning, think about what happens to an area when a big storm passes through enough fresh water falls to likely dilute the water column slightly in an area for a period of time until the currents even it out again.
Reasoning, think about what happens to an area when a big storm passes through enough fresh water falls to likely dilute the water column slightly in an area for a period of time until the currents even it out again.
Posted on 9/22/26 at 12:47 pm to HoustonGumbeauxGuy
quote:
Do you run an S&W test on your tank regularly and clean it out with Varsal?
Um, no? Is that some kind of plant operator joke?
Posted on 9/22/26 at 1:06 pm to dakarx
quote:
Letting it drift a bit here and there won't hurt.
Tank water will evaporate
Salinity will fluctuate
Average 1.024 should be great
Posted on 9/22/26 at 1:26 pm to Clyde Tipton
quote:
I've done freshwater aquariums for years. I've been doing a lot of reading and youtube watching preparing to set up a saltwater tank.
With the internet and plenty of books it is so much easier and convenient these days. My Pops (along with myself) got into saltwater tanks years ago — before the internet was much of anything really — and finding reliable information was akin to a scavenger hunt or an in depth investigation. People in the hobby seemed to guard info like it was gold. It was mostly trial by error in a hobby that was very expensive and unforgiving.
Posted on 9/22/26 at 1:30 pm to LegendInMyMind
1.024. Get you one of these baw 
.
. Posted on 9/22/26 at 2:36 pm to Clyde Tipton
quote:
Um, no? Is that some kind of plant operator joke?
That's exactly what it is.
Posted on 9/22/26 at 2:38 pm to Clyde Tipton
1.025 but it drifts with evaporation. Nothing in the tank seems to care.
Posted on 9/22/26 at 2:38 pm to Clyde Tipton
9.8 m/s^2
Posted on 9/22/26 at 3:37 pm to Clyde Tipton
1.025. I mix 35 gallons every 3 weeks for water changes. 17 cups of Reef Crystals will bring me to exactly 1.025.
I just read through your post again. Yeah, you should cater your tank to your planned inhabitants. But with some exceptions, most fish and inverts can adapt to salinity in the range you mentioned. The most important thing is consistency.
I started with high tech freshwater planted tanks, and set up a reef tank in my office a few years ago. I've learned from these tanks that aquariums thrive on three things:
Flow
Nutrients
Consistency.
Get your flow right, keep nutrients in check, consistently do your maintenance (change filter socks, weekly water changes, dosing, etc)
I just read through your post again. Yeah, you should cater your tank to your planned inhabitants. But with some exceptions, most fish and inverts can adapt to salinity in the range you mentioned. The most important thing is consistency.
I started with high tech freshwater planted tanks, and set up a reef tank in my office a few years ago. I've learned from these tanks that aquariums thrive on three things:
Flow
Nutrients
Consistency.
Get your flow right, keep nutrients in check, consistently do your maintenance (change filter socks, weekly water changes, dosing, etc)
This post was edited on 9/22/26 at 3:41 pm
Posted on 9/22/26 at 4:13 pm to Clyde Tipton
The main thing is to not have it fluctuate
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