had a thirty gall tank the glass cracked down the side it looked like it started under the plastic trim and went down the side of the tank lost all the water but maybe 5 gallon or so the only survivor was my red tail albino shark lost all my barbs. got new glass put it in resealed it and it is running balanced out last night my chem were at the normal once again went to get another test kit ran out of some testing drops so off to the fish store to buy another kit picked it up for 20.00 was looking around checking them out and seen this sale got 5 tiger barbs and 5 green barbs 4.00 they marked them as differ fish and put them on sale for .40 a piece thats what they marked on the tank in marker and on the bag the gal cought it at the counter called the manager i got the sale price but they got it changed on the tank now as far as the crack goes dont know how what or why it just did 8 years old and has been running with out any leaks or problems unlucky week but a lucky day :werd: