Take an airline valve and glue it into a hole in the top to bleed the air off. Once the air comes out, shut the valve for normal operation.
Just my $.02
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37 FW Angels and Danios
29 FW Tiger Barbs and a Blood Parrot
55 FW Mbuna
10 FW Glofish Danios (at my wife's office)
2.5 Hex Sam the Betta |