about signs, i also read varying tank requirements all the time. Man, all i know is use common sense. I dont put in 5 oscars in a 10 gallon. or a basic pleco in anything less than a 75 but the stores have 10 gal as min for some and 50 gallon min for others. Its all a sham. Also the worst of all time advice is about 2 amateur employees who told me oscars must be fed feeder fish. i couldnt believe my ears. sure ill feed them feeder fish if i want to see a nice hole in their head. wow lfs really is all about $$$$