I can tell you clearly that Alec's damage to fish is very small and can be ignored. Before raising fish in a new tank, soak it in 40% salt or potassium permanganate (water turns dark red) for disinfection. Don't put the fish immediately after water injection. Circulating water through the pump, about a week, put one or two tails in for trial cultivation. If you don't die, you can officially raise it. In order to save the time of hydroponics, nitrifying bacteria can also be added artificially (sold in fish farming market), and if it is economical, children's yogurt can also be added in a small amount. Alec keeps fish not because of its harm, but because of how to maintain it. Alec, also known as plexiglass, is soft, so when cleaning the fish tank, you must not brush it with rough things, it is easy to scratch, and once scratched, there is no way to repair it. It is not resistant to high temperature, but the temperature of fish culture does not pose a threat to it.