how long do fishtanks last?

I ask because I the seals on my 29 gallon planted tank seem to peeling at the
edges.  I bought the tank new in 1989, and it has been up and running
continuously since.  There are many algae-eating critters in the tank
(bristlenose pleco, various species of snails, an oto or three, etc.), and I
suspect one or more of them have been gnawing on the seals to get at the algae
growing on on them.

Is it time to buy a new tank, or am I being paranoid?


Leigh

http://www.fortunecity.com/lavender/halloween/881/