Might be something to the tank space point.I have a few growouts in my 55 that seem to have reached a growth plateau lol.
Interesting discussion, I agree it has to be a balance of both food and water conditions, but ultimately IMO it is tank space that will give good growth, over both nutrition and water conditions. The increase in growth and appetite I have seen in my fish (plecs, black aro, geophagus) since moving from a 400L tank to a 2000L tank is huge. The water in the 400L was always good with regular large water changes (far higher percentage than they get in the big tank), and the water temp/parameters and diet haven't changed at all since moving tanks.
I am 100% convinced and would be willing to put money on there being considerable difference in growth rate and size of two identical groups of fish being raised in identical conditions with the one difference being tank size, as I have seen it with my own eyes with a wide range of species from cichlids to loaches, polypterus to plecs. Big tanks = big fish.
Interesting discussion, I agree it has to be a balance of both food and water conditions, but ultimately IMO it is tank space that will give good growth, over both nutrition and water conditions. The increase in growth and appetite I have seen in my fish (plecs, black aro, geophagus) since moving from a 400L tank to a 2000L tank is huge. The water in the 400L was always good with regular large water changes (far higher percentage than they get in the big tank), and the water temp/parameters and diet haven't changed at all since moving tanks.
I am 100% convinced and would be willing to put money on there being considerable difference in growth rate and size of two identical groups of fish being raised in identical conditions with the one difference being tank size, as I have seen it with my own eyes with a wide range of species from cichlids to loaches, polypterus to plecs. Big tanks = big fish.
If we are gonna throw all factors in than I'd have to say beyond the things we can't control (genetics)......
Space. Hasn't failed me yet either. Bigger tank equals less stress, more dilution meaning healthier fish.
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