i've got the juwel internal filter which runs with 6 different sponges - one is fine cotton which you change weekly according to juwel - still hasn't helped I think it's something growing/living in the water that has got on top since i overfed them
Well i changed them at about 2 week intervals - all three main cleaning sponges (2 fine bottom sponges & coarse sponge). They are arranged/stacked like so:
Fine cotton sponge (changed weekly as per jewel) (space) Charcoal sponge Nitrate removal sponge Coarse filter sponge (change every 3 months as per jewel) (space) Fine Sponge Fine Sponge (where most bacteria live, change every 6 months one at a time according to Jewel)
Have changed the 2 fine sponges recently, which are probably the main ones, but left weeks between them, so not to lose bacteria
Think the water changes will clear it eventually, as there is only a limited amount in there and whatever it is in it must be decreasing surely
There are 3 main filter sponges, which i have changed individually over the last 8 weeks.
Will keep on with the small, frequent changes That's what i was thinking about it bothering me more than the fish - if the water quality was poor they would have got sick or even died, but they are quite happy and normal.
Have learnt my lesson to be careful how much food i shake out of the pot
Think i can almost answer it myself, but will explain...
Before xmas, i didn't change the tank water for 3 weeks as it look crystal clear and readings were normal (and i had 2 major exams). Around this point i think i overfed the fish ONCE! and the water turned white and murky overnight. Since then, no matter how much water i change, or filter sponges it won't clear. I have done a half water change, which was 120 litres, nothing helps. Am just changing 2 buckets every few days at the mo, to try and clear it. Again, readings are normal. I don't think the water is affecting the fish, they are all healthy and acting normal and have been for weeks
A lfs mentioned phosphates to me once, could a rise in this have done it (after i overfed the goldys)
ps it's good to be back (i don't quite know where i have been, but i am here now!)