Having recently come back to the hobby after about a 20 year gap I've found so many things have changed.
We used to have 2ft, 3ft 4ft etc tanks. Now we have 55/90/200 litre etc tanks. The way we worked out stocking levels was by calculating the surface area and dividing by x (which I can't remember) to see how many fish could be kept. This would multiply if filtration was used. Power filters back then were a bit rarer than now. Undergravel filters were the norm for larger tanks.
Cycling is another relatively new thing (to me at least). It was recommended when setting up a new tank that you left it for 3 days to let any harmful elements in the water dissapate. Where I lived I was lucky in that the water was great for keeping fish, so once the temperature was right then in they'd go. I honestly didn't lose fish using this method, and as I had over 40 tanks at one time, if it didn't work I'd soon have noticed. Nowadays the water we get from the tap is no longer untreated and it may be that whatever is in it now could be harmful.
Surprisingly there arent that many new fish around, maybe a few slightly different cichlids and the odd fish like the Celestial Pearl danio, but there are a lot more shapes, sizes and colours amongst the fish I used to know. I hate seeing fish like Balloon mollies and ridiculously long finned varieties of many fish. This has been done with goldfish for years, but somehow I feel its wrong to breed fish for defomities. I'm sure it can't give them a better quality of life.
There will certainly be more tank bred fish on the market now which is probably good for the environment but bad for fish quality in a lot of cases. It's hard to find a natural coloured silver angel fish with good marking for instance, but conversely it was harder to find well marked tiger barbs back then.
BETTAS - We didn't have these, we had Siamese fighting fish, not sure why this changed unless it for ease of typing, but betta doesn't sound nearly so interesting.
Lots of changes, mostly for the better, but some I'm not so sure about.
We used to have 2ft, 3ft 4ft etc tanks. Now we have 55/90/200 litre etc tanks. The way we worked out stocking levels was by calculating the surface area and dividing by x (which I can't remember) to see how many fish could be kept. This would multiply if filtration was used. Power filters back then were a bit rarer than now. Undergravel filters were the norm for larger tanks.
Cycling is another relatively new thing (to me at least). It was recommended when setting up a new tank that you left it for 3 days to let any harmful elements in the water dissapate. Where I lived I was lucky in that the water was great for keeping fish, so once the temperature was right then in they'd go. I honestly didn't lose fish using this method, and as I had over 40 tanks at one time, if it didn't work I'd soon have noticed. Nowadays the water we get from the tap is no longer untreated and it may be that whatever is in it now could be harmful.
Surprisingly there arent that many new fish around, maybe a few slightly different cichlids and the odd fish like the Celestial Pearl danio, but there are a lot more shapes, sizes and colours amongst the fish I used to know. I hate seeing fish like Balloon mollies and ridiculously long finned varieties of many fish. This has been done with goldfish for years, but somehow I feel its wrong to breed fish for defomities. I'm sure it can't give them a better quality of life.
There will certainly be more tank bred fish on the market now which is probably good for the environment but bad for fish quality in a lot of cases. It's hard to find a natural coloured silver angel fish with good marking for instance, but conversely it was harder to find well marked tiger barbs back then.
BETTAS - We didn't have these, we had Siamese fighting fish, not sure why this changed unless it for ease of typing, but betta doesn't sound nearly so interesting.
Lots of changes, mostly for the better, but some I'm not so sure about.