Fish store owners are not wealthy people. One store here has been in business for over 50 years and the guy still looks like a homeless person.
They don't purposely get fish and try to make the thing sick so it crashes your tank.
If the fish gets sick, it is our fault, never the LFS. He just buys fish unseen from a wholesaler who gets them unseen from a supplier. If the fish is alive, they ship it. Many of them arrive dead.
Learn what a healthy fish is supposed to look like and buy those. Virtually "all" fish are infected with something and it is our job to deal with it however we feel is best. That is part of the hobby.
I personally like to buy fish right out of the shipping box before they put them in their tanks.
I keep my fish immune so whatever disease they are carrying won't affect my tank and I figure not allowing the fish to go into the store tank is one less stressful event the fish will have to go through.
I don't want them quarantined by the store or me. I will pay more for fish right out of the sea with no medication, quarantine, observation or social security.
I think there aren't more people interested in doing this because of a lack of creativity, patience, money, understanding spouse, time, space, and a big one, to many ways to pursue this with to many methods and very few of them being successful.
If one were to read these forums and noticed all the perceived problems they would have to be nuts to jump in.
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What is the failure due to? Info? Attempts at difficult species? Would having proven stocking list help out? For example if you are a beginner with a 55 gallon tank:
You can attempt stocking list A,B,C, etc.
With a list of easy fish, corals, and inverts. With an ideal clean up crew because the clean up crew is very important.
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The failure rate which is probably close to 90% is do to a large variety of factors. Individual opinions for start. You mentioned that "an ideal clean up crew is very important" .
I don't think they are that important and I feel all you need is bristleworms like all tanks will get then anyway. I have hermit crabs and shrimp because I like them.
Water changes is another one, At the first sign of anything most of the advice is to change the water which almost never works. People are still using cleaner shrimp to cure ich. There are so many falsehoods that have been circulating for decades that it boggles the mind.
There are no clear cut "correct" rules as this, like most hobbies relies on just experiences and guesswork. The vast majority of hobbiests have been in this for a year or two so their experiences may not be the best advice to follow but due to the internet, we unfortunately listen to everything
Just my opinion of course.
