"Jerry Baker" wrote in message news:OaBRg.1460$fl2.989@trnddc02...
Pszemol wrote:
Is this tank purchased with overflow or you built it yourself?
Usually, tanks available at stores (Allglass, Oceanic) have
overflows properly designed to rise water above frame level.

This tank was purchased with the overflow built-in.

Who is the manufacturer ? Is this Allglass tank ?

This is interesting that such a big tank has only one 1" overflow...

I have a tank half the size (3 foot, 58gallons) with such a 1" overflow.
I use one QuietOne 3000 pump which is rated at about 750gph.

Your tank should have 2 or 3 such overflows or bigger hole.
Sounds like a home-made overflow in this tank...

p.s. what pump do you use ? how much gallons/hour or litter/hour ?

The pump is a cheapo Rio 1700 (650gph).

The overflow has 12 1/4" teeth. I have to plug up 8 of them before the
water level gets above the plastic rim. My only task now is to plug them
up in a non-permanent way that isn't visible while viewing the tank.

Or design a new comb from a piece of black plastic and
cover the old one slightly higher.