Can A Goldfish Tank Be [almost] Self Sustaining..?

Eclecticoldsod

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OK, this is what I have...
A 24'' by 15'' by 18'' high glass tank, with a grow-lux tube in the lid, and an internal power filter. It is unheated (British living-room temperature...) There is tuffa rock glued to the back and sides, and a some very old bogwood – both smothered by Java moss. The substrate is a 2'' layer of glass marbles, in which grows a pot of huge elodea, another of cabombia – and there are floating plants of that dreadful/lovely cabbage with long, trail roots (I compost a whole handful of that stuff a month!)

Maintenance: I clean out the filter once a week, change a bucket of water once a week, syphon gunk from the marbles about every six months, do a total clean out about once every five years.

The tank contains one 8 inch-long, 20-year-old fantail goldfish, a constantly breeding herd of White Cloud Mountain Minnows, gigantic Golden Apple snails, red ram's horn snails, trumpet snails, tubifex worms from the marbles, and Gammarus freshwater shrimps from the Java moss...

I am only feeding this lot a [large] pinch of dry fish food every morning, sometimes some live food once a week, and any bits of left-over vegetables from Waitrose...

If this is not just about the 'almost self sustaining' tank of dirty-####e-loving-life, I really don't know what is..!
 
fishkeeping has been complicated over the past few years that is for sure. interesting you have got away with that. my fish always used to die when i overstocked/underfiltered etc.
 
That is great im trying to get the same sort of system going for my 30 galon tank
 
That is great im trying to get the same sort of system going for my 30 galon tank

I know it goes against almost all of the rules, but if it ain't broke, don't fix it. I think the marbles are the magic ingredient – being large, they let all the goldfish crud to filter down to a very aerobic bottom layer. The trumpet snails love it (but they would). The plants root happily in it. The tubifex worms breeding in it is perhaps not too surprising, as it can't be much different to their usual river mud. What surprised me was the shrimps breeding in the tank, but the colony has been going for 20 years, so they must be happy. The apple snails – despite being more used to slightly warmer water – lay eggs regularly.
I always think – if it breeds, it's happy... :D
 
Well, seems to me you are actually doing everything that is usually recommended to this tank- internal filter, weekly water changes. regular filter maintenance. All sounds good (if not exactly self-sustaining).
 
Well, seems to me you are actually doing everything that is usually recommended to this tank- internal filter, weekly water changes. regular filter maintenance. All sounds good (if not exactly self-sustaining).

Yup, I should perhaps have said that 'life' within the tank is almost self sustaining – God, of course, is working away in the background [in his usual mysterious ways...] :cool:
 
:crazy: It just seems cruel to me, keeping an 8 inch fish in a tank that small. Is there a reason you don't upgrade the tank size? JMO.
 
:crazy: It just seems cruel to me, keeping an 8 inch fish in a tank that small. Is there a reason you don't upgrade the tank size? JMO.

He's been in there since he was an inch long, about 20 years ago. He is a stately old gentleman now. He doesn't mozz around the tank like he used to – apart from two feeding frenzies a day, a couple of circuits of the tank and lots of sleep keeps him happy. If it ain't broke – don't fix it..!
 

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