Ok, I'm in a Covid-19 lock down and have time to think.
Tell us what is the most frustrating advise you get off this forum site. Hopefully that will help us so called experts or experienced fish keepers some idea of how to help those new to the hobby to become more confident and more informed. I think sometimes we become to long winded and give way to much detail rather than sticking to the basics.
What do the new to the world of fish keeping want to here from us.
All I can say is that I've been keeping fish since the 80's and the paranoia that has taken over the industry by big companies trying to sell products through fear is insane.
Theories and facts. Well, here are a few facts. I've never ever cycled a tank without fish in it and I've never lost a fish due to it.
The way to cycle a tank asap is to have a small amount of fish to develop the cycle. This empty cycling tank business never used to exist.
We want fish in pure water right? So put them in pure water. Then allow the natural cycle to develop by doing water changes frequently to keep nitrates low. I do introduce bacteria from other tanks filter material however I recently set up a 70 gallon with zero cycling and a few small fish. No added bacteria. (Never lost a fish and have about 30 fishing that tank(including a male Betta)
Naturally the fish waste begins the cycle. Throw plants in there to additionally help. Big ones.
What people are missing are water changes. If you have an issue, its probably because you're trying to solve a problem with products. Its not a lake. Do 50% water changes 3 times a week and see what happens.
What are my water parameters. Don't know, don't test, unless experimenting.
Here's a novel idea. If your fish seem lethargic, do a 50% water change and notice the difference. Ever wonder why fish get so active and frisky after a water change? You are naturally purifying the water.
I didn't make this stuff up. I was fortunate enough to study with a mentor, one of the greats in the hobby, Dr.James Langhammer. Of not for him some species would be lost forever.
Through decades, what hecsaid was true. These fish adapt to the local aquarium conditions.
I keep guppies in 78 degree water inside and outside in 88 degrees. The outside ones do better and grow bigger. No filter, just a bunch of big plants. Not much food as the tank is full of life. Hardly any water changes. Outside tanks are only 20 gallons, so I just change 10% or so weekly.
The caveat to this who would jump on me is that, yes, there are species needing certain conditions. My Discus were certainly taken care of differently for example. Some fish which are difficult to keep alive or need certain conditions to breed are exceptions. I'm talking about the 95% of fish you find in your lfs or chain store.
Most of you are not keeping extremely rate and sensitive livebrarers, like certain Goodeids, which I do.
Trust me on one thing. Do a 3 month experiment. Do nothing but 50% water changes 3 times a week(more for 10 and under tanks) that will fix any nitrate issue you have. Do no testing unless you want to prove my point. Don't worry, overfeed, yes, most people underfeed,(fish, in nature eat most of the time, except big predators) watch your fish thrive.
One more caveat, if you live in an area where you have extreme water conditions, that's different bit only because you have to establish what they are. Fish stores in those rare locations will let you know.
What is far more important than overworrying about balancing tank chemistry, is to study fish. Read and watch everything you can.
If you want complexity, focus on food and types for different species, start breeding, study genetics, learn everything you can about the natural state of the fish. More important than water, to which they'll adapt, is environment.
People keeping fish, Plecos or Red tail sharks,for example, in full light and not giving completely dark cover is cruel. I have a huge red tail shark who spends 80% of the day, or more in a cave, in 90% darkness, totally out of choice. He shares it with a Synodontus Eupterus, which I almost never see. I give that cover because they need it. Many people selfishly want to see the fish, more than give them natural habitat. That's just me though, I design my tanks for the fish, not for me. There are tons of open water species. Surprisingly though, some of those take more cover, if offered than you'd think.
I hope this helps take the stress I read about all the time on here from some people. Enjoy your fish!