12-03-2008, 10:19 AM #11Originally Posted by melbfish20
If the primary purpose of the water change is to reduce nitrates, employ some alternative nitrate reducing measures (add a refugium, increase the sand bed depth, add more live rock, etc). A FO/FOWLR tank with nitrates consistently at 5ppm or less would logically require fewer water changes than a system with nitrates consistently at 10ppm or more.
In a reef tank, though, water changes replenish essential elements which have been depleted or reduced, regardless of nitrate levels. I do huge water changes (50% every several weeks) on my reef tank even though nitrates are undetectable at all times.
Originally Posted by jimpierce
Salt water replaces salt water during water changes. I occasionally top off with salt water to replace salt removed from the system via protein skimmer skimmate (were I to continuously top off with RO/DI water, salinity would gradually take a dip).
Last edited by kaybee; 12-03-2008 at 10:24 AM.African cichlid and saltwater aquariums
12-03-2008, 03:57 PM #12
I always do 10% weekly water changes and top off with only fresh RO water. I haven't really had to top off with saltwater, I've never seen a drop in salinity due to skimming, but maybe that's because I do a really dry skim.
29 gallon-planted community
20 long frag tank
75 gal-planted goldfish
75 gallon mixed reef with 20 gallon sump
12-03-2008, 08:56 PM #13Originally Posted by unleashed
12-04-2008, 06:16 AM #14Member Angelfish
- Join Date
- Jan 2008
after doing a fair bit of research last night I have decided that it would not be right to keep a yellow tang in a 85 G.Some say it would be ok but I think that 100 G is absolute minimun , 125 G is more ideal.
12-04-2008, 06:57 AM #15
don't forget that it is not only the water volume which determines which fish you can and can't keep, it is also the swimming space.
IMO, an 85g would suffice for a yellow tang, IF you have lots of swimming space between live rock and open swimming space. Also, length of the tank also plays a significant role in determining suitable species
12-04-2008, 09:16 PM #16
I figure I still have a few more months with out Blue Hippo Tang before he will be in need of more space. Now if I can convince my wife that we shouldn't get fish that will out grow our tank I will be so happy!