Protein skimmer/biofilter query

Steve O'Shea

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Re: Extra salt needed

mikeconstable said:
Sounds like you are going to have to add extra salt in some way or other, but variations in temperature will make it either 'hit and miss' or rather slow.
Maybe you could reduce the condensation by having a cover over the tank but you will not prevent it completely if you have a skimmer or airstone?
Danger must be that the eggs will be damaged before you can notice?
Have any hatched in the low s.g. water yet?

About 50 eggs have hatched so far, and the squid appear fine (although they're not in there for any longer than a couple of hours); they're moved immediately to another tank (first thing in the morn; they tend to hatch only in the morn). There are about a thousand larvae ready to hatch from these eggs.

I'm not happy with the colour of the water either (it's a bit dark), and I might be verging on neurotic, but it also feels grainy (it just doesn't feel right), so I'm giving it repeated draining (1/3rd at a time) daily. There are 2 protein skimmers and 2 biofilters (new carbon) working away on that tank now; the protein skimmers aren't taking a lot out right now, though a couple of days back they were extracting quite a bit). I just don't like things happening in tanks that I don't understand. Probably have a few too many things on right now, and quite a few things are slipping.

I cannot drain the entire tank as any disruption to the eggs will cause premature hatching and pretty much loss of all larvae.
 

Colin

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You never actually mentioned what the SG is in the two tanks, i dont think i would do anything to change the salinity, you have such a bonus in having it on tap, it would be a shame to have to mess about with salt.

A brand new skimmer can take a couple of weeks to work properly, always seem to do better once they get a film of scum/bacteria inside the column. If they are not removing anything it normally means that there is nothing to remove.. sounds too easy but a 1/3 a day water change is more than enough to remove toxins.

No idea about the dark water but different manufacturers of tanks use different glass with different tints, also some glass like 'K' glass can feel grainy so it may just be that???

Why move the newly hatched? How do you do it and is the tank you move them to at the sam etemp SG etc????

Dont worry, this'll work this time :smile:
 

Steve O'Shea

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Colin said:
A brand new skimmer can take a couple of weeks to work properly, always seem to do better once they get a film of scum/bacteria inside the column.

Why move the newly hatched? How do you do it and is the tank you move them to at the sam etemp SG etc????

Dont worry, this'll work this time :smile:

Howdo C; I'll repeat the SG measurements morrow and fire 'em through. Strangest thing. I'm in a room that might reach 25°C at this time of year, and the chilled tank is running at ~ 18°C. The condensation on the outside of the tank is significant. So I mentioned Mike's post about the condensation IN the tank (at the air/water interface) and the curator there says ..... and I'm scared to repeat this .... not an issue. I can see where he is coming from. I'll be experiencing evaporation (because of the temperature difference, but I'll also be experiencing condensation ... and that the two 'just might' compensate. Mike??? Difficult isn't it; 6 of this and half a dozen of the other?

Bizarre. I do have special lids for these tanks, but not a lid that will allow the protein skimmer to fit (they're rather ungainly things aren't they; there must be a model that you don't have to have inside the tank .... I'll do a search when next at the pet shop ... or, as you say.... LFS :wink: [learning the lingo]).

... now, C, you have me scratching my head. These squid are on public display, and a dirty film on the protein skimmer just doesn't look good. So, in addition to cleaning them out daily (or every second day), I get rid of that scum lining the funnel. Am I doing wrong?? They're obviously working, but I'm inclined to believe you for 2 reasons: 1) you know what you're talking about, and 2), I think the amount of crap that deposits in the container increases with the amount of scum deposited on the funnel. You know, this is a rather easy experiment to see whether this is true or not - just have several identical protein skimmers in one tank, clean one regularly and just empty the container on the other (same periodicity). Let's do it!
Cheers
O
 

Colin

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ok game on!!!!!!

i do think that they need cleaned from time to time but some of my best skimmers have ran literally for months and got better with age:smile: the collection cup itself (not the main tube) should be cleaned on a more regular basis proportional to scum collected.

if you really really really wanted to get into it there is an entire science about foam fractionators... its all to do with stuff like bubble size.. length of time in solution.. bacteria at work in riser column etc etc... if its pulling out crap its working :smile: that works for me. but please try the experiment... im interested...

hows abouts drilling the tanks and using sumps therefore the equipment can all be hidden from public view????

i would be tempted to have a big sump... 100gal+ with a constant drip drip drip of new seawater... slow enough to not affect temp but big enough to do a constant water change... might not even need skimmers then? you could supply as many tanks as need be from one sump
 

mikeconstable

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Condensation!

Colin is right when he suggests you could bleed in new salt water and run the excess old water to waste. I would have thought that if the sg had decreased very significantly you might have noticed the increase in volume? (unless the excess just flowed to waste?)
If the water temperature is below the dew-point of the air there will be no evaporation, only condensation - a one-way flow.
 

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