Use of Additives

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Hi everyone,

I was at the LFS yesterday and we got around to discussing the use of additives, most especially magnesium.
I have been into marines for about 18 months and with MASA help since Feb last year when I redid my setup and more recently (November) replaced the crushed coral with aragonite in my DT.

My current setup is as follows:-

Display tank - 1500 x 480 x 480
Sump 900 x 300 x 300
4 x 39w t5's 10000k
2 x 54w t5's 20000k
1 x 6400k energy saver at sump
2 x 1500 seio powerheads
1 x lifetech 4300 return pump
1 x ts2 skimmer
1 x hang on overflow box
5cm thick aragonite sand bed in DT
300 x 300 x 150 DSB in sump
+/- 50 kg live rock

The livestock that I have is:-
1 x Scopus tang
1 x Rusty Dwarf Angel
1 x Flame angel
1 x Coral Beauty
2 x Clarkii Anemone fish
2 x Goldenhead Gobies
1 x Long Nose Hawkfish
1 x Yellowtail Damsel
1 x Bicolour Chromis
1 x Pyjama Cardinal
3 x Cleaner Shrimps
1 x Coral Banded Shrimp
1 x Tube anemone
1 x Featherduster
1 x coco worm
1 x sea lily

Corals:-
1 x frogspawn Euphillia
3 x hammer Euphillia
1 x pumping Xenia
2 x Xenia
3 x Zoanthids
1 x Sun Coral
1 x Pipe Organ
1 x Gonaporia
2 x Fox
2 x Mushroom
1 x rock with 10 small red mushrooms
1 x Sinularia
1 x Elephants ear Leather
2 x Doughnuts
2 x Cavadularia
1 x Star polyps
I do a 12.5% water change every Saturday.
I add +/- 40ml of Jaquesb Kalkwasser mixture every Sunday to Friday.
I test my water parameters every Sunday:-
Temp 25 C
Sg 1.024
PH 8.2
Ca 375
Kh 8
Phosphate 0
Nitrate 5
Alklinty "Normal"
I feed my fish with a 1/4 teaspoon of dry flakes every second day and with a frozen block every other evening (Brine, bloodworm, hake, or mussel)
The corals are target fed 6 days a week with a 1/4 teaspoon of Coralfrenzy diluted in 250ml of tank water.


After this long explanation now for my question - should I be adding any other additives (e.g. - magnesium) or should I just leave it be and react when any parameters start going out (e.g. add Bicarb to raise Kh).
Any suggestions would be welcomed.
 

dallasg

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seems like everything is perfect as is.
i think if u happy and everything looks good keep it the same.

have u got a pic, sounds awesome
 

viper357

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You would have to get a test kit for Magnesium before you start dosing it, not many people seem to dose Magnesium but it is an element that is useful in our tanks, the easiest and cheapest way to increase/maintain your Magnesium is to use Epsom Salts bought from Spar or Pick 'n Pay etc.
 

jacquesb

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I have read on WWM and other sources, that corralline algae, as well as calcium growth, depends on both calcium as well as magnesium.

If your salt has enough magnesium content, then you should not need to add extra magnesium to the tank.

If the salt does NOT contain enough magnesium, I would say, YES, go with Viper's suggestion. BUT, as with everything - you SHOULD ideally have a test-kit to test, if you add things to your tank.

Raising magnesium also seems to resolve issues with outbreaks of bryopsis nuisance algae...... Increasing the magnesium kills off bryopsis the best.

Nothing else touches bryopsis, unfortunately.
 
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At present the growth of corralline algae is good and even if I must say it myself the corals in my tank look stunning and grow like nothing I've seen before. I actually want to know why we should add these trace elements at all - as for magnesium Jacques thanks for your answer.
 
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You would have to get a test kit for Magnesium before you start dosing it, not many people seem to dose Magnesium but it is an element that is useful in our tanks, the easiest and cheapest way to increase/maintain your Magnesium is to use Epsom Salts bought from Spar or Pick 'n Pay etc.
Is it true, that dosing with Epsom Salts, can cause Sulphate problems if used in large amounts ?
 

459b

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is it true, that dosing with Epsom Salts, can cause Sulphate problems if used in large amounts
yes, epsom salts is the common name for magnesium sulphate. So while the magnesium gets used, the sulphates will build up.....but nothing regular water changes wont fix.
the magnesium you buy from the LFS is magnesium chloride.
 

viper357

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Is it true, that dosing with Epsom Salts, can cause Sulphate problems if used in large amounts ?
I have also read that quite a few times, if I remember correctly it was said that Magnesium Chloride is much better than Magnesium Sulphate (Epsom Salts), apparently a buildup of sulphates is not good in an aquarium, but then again I have also read that the actual amounts of sulphate accumulated from dosing Magnesium Sulphate is negligible and shouldn't be a concern. From my understanding, the majority of brand name Magnesium supplements normally consist of about only 10% Chloride and 90% Sulphate. I'm not too sure. We need input from someone like Midasblenny about this issue.
 
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You could also always consider a product like seachems Reed Advantage Calcium which doses calcium, strontium and magnesium in levels typically consumed within the reef environment
 

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