I was reminiscing about the old days of the aquarium hobby with another BCA member by phone last night, and recalled that I had a 25 gallon (Imperial) tank running for about 30 years with only an undergravel filter. I never siphoned out under the gravel - just let it run the whole time, and would periodically add a carbon cartridge to the top of the outflow.
I don't remember ever having a sick fish in all those years, or an algae outbreak. Everything just went happily along. Mind you, the tank was probably understocked by anyone's standards. But the kribs raised several sets of babies and I never worried about them being sucked into a filter.
In the past few years I've tried canister filters, HOB filters, in tank filters, reptile tank filters and sponge filters, as well as no filter at all. This has been fun and I've learned a lot about the biological cycle. But sometimes, I miss the old days when all I had to think about was an air pump!
I don't remember ever having a sick fish in all those years, or an algae outbreak. Everything just went happily along. Mind you, the tank was probably understocked by anyone's standards. But the kribs raised several sets of babies and I never worried about them being sucked into a filter.
In the past few years I've tried canister filters, HOB filters, in tank filters, reptile tank filters and sponge filters, as well as no filter at all. This has been fun and I've learned a lot about the biological cycle. But sometimes, I miss the old days when all I had to think about was an air pump!