Tropical Fish Keeping - Aquarium fish care and resources

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migdem 06-02-2009 06:59 AM

Raising Tank with Yellowish water
Hi all,

I have a problem with my current setup. I have an aquarium of about 40 litres. I have an internal filter that only have a sponge. Now the problem is that the water is always yellowish and the sponge clogs tooooo much. I do water changes of about twice a week and every week i need to wash the sponge in the same water that i had just removed from the aquarium. I house around 30-40 fish that are being raised. I have some swordtails and guppies. How could i arrange the problem. Lately i had around 15 small fry of around 1 month old and found them all dead :cry:.

Now how can i arrange the colour of the water?
Nitrate is at 1. How can i arrange this?
I have a small reading lamp as a source of light. Do i need to change this?
Why does the sponge clogs so quickly?

Thanks in advance

Byron 06-02-2009 11:26 AM

You have too many fish (even fry) in this small tank. 40 litres is 10 gallons, and 30-40 fish will produce a lot of waste and ammonia in this small a tank. Thirty or more newborn fry are OK, but once the fry start to grow, you should cull them so that there are only a few. There was an excellent article in the December 2006 issue of TFH by Laura Muha entitled "Fish Growth vs. Tank Size" that explained all this, but basically you either need much more room for fry to grow properly (develop their internal organs and systems) or do daily (yes, every day) major water changes. It is not the size itself that restricts the fish, but the water conditions; in a small tank the water quality deteriorates much more rapidly than in larger tanks.

SinCrisis 06-02-2009 11:47 AM

the basic rule is 1 inch per gallon so your basically around 5-6 times over your tanks max capacity. Fix this and the rest should start to fix itself.

migdem 06-02-2009 04:21 PM

So since i cannot get a bigger tank whats the best thing to do in this situation?

Byron 06-02-2009 05:59 PM


Originally Posted by migdem (Post 200838)
So since i cannot get a bigger tank whats the best thing to do in this situation?

I answered this question in my first post. Cull the fry (which means removing some of them so the remainder can develop better) and/or do more maintainance to keep the water quality better because of the small volume.

Swordtails and guppies are, as you certianly know, livebearers, and as such their fry tend to survive more than egg-laying fish because the livebearer fry are larger from the start and easier to feed. If you leave them with the parents, many of them would likely be eaten.

migdem 06-02-2009 06:11 PM

Ok so if i make a change of 10 litres every 3 days is fine? Also can i squezze the filter sponge in the aged water so filter will not be clogged?


SinCrisis 06-02-2009 09:02 PM

i feel like u need to change 10 liters every day...

migdem 06-03-2009 02:12 AM

Ouch ok. Right now i feed them twice daily. Should i feed them once maybe i dont have too much waste?

JohnnyD44 06-03-2009 06:53 AM

I agree with Byron, cull the fry....if you cut back on the feeding, this will help with the amount of waste.

I agree with Sincrisis are way over stocked....take byrons advice about the fry and sin's about water change, atleast every other day

What kind of filter are you running?

Let us know how you're making out!! You've gotten some great help from the other two in here!

1077 06-03-2009 08:06 AM

I agree with the above posts. Lose some of the fry (fish), I would also add a filter rated for twenty gal to this tank while leaving the sponge filter in place. You could place another sponge over the end of the new filter to keep babies from being pulled into the filter.Using carbon cartridge in the new filter would help with the yellow water but as others have noted,, Ten gal is too small to raise more than a dozen livebearers in my humble opinion.

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