kraemerwa2003 said:
use your better judgement...as SirWired said ^^^, it's a RULE OF THUMB, and ppl should not be jumping on him for it. the One Inch rule works MOST OF THE TIME with small tetras, danios, smaller bred guppies. However, it wouldn't work very well to put four common plecos in a 20 gallon...
it does not work all of the time, in fact it never works.
according to the rule, you can have 1 neon in a 1 gallon tank. WRONG. neons need at least 10 gallons bacuse they need a school of more than 6.
accotrding to the rule, you can keep and angelfish in a 6 gallon. wrong again! this will only result in stunting.
according to the rule, you can keep 1 tiger barb with 1 betta and experience no problems. nope wrong. tigers need more than 6 other buddies to stay healthy, and they should never be put in tanks with long finned fish.
0/3, the rule has failed this test
it might sound extreme, but its not. any regular 6 year old kid is going to ask the guy at the counter how many fish he can have in his 10 gallon, and the clerk is going to say, 1 inch per gallon, and then the kid goes and picks all of the fish he like, as lond as it stays under 10". he wants a tiger barb and an angel, but the clerk says, they might fight, and the kid says, but its in the rule, and the clerk holds no more obgections
stuff like that does happen at large chain stores