Bro.. better to get a sump lor.. it better for ur tank.. u can buy a over-flow pipe as u are not able to have hole drilled in ur tank.. you can place ur sump outside or beside ur tank.. but it on the floor lah.. tt wad i think.. and my 2 Cents.. haha.. if i sae anything wrong.. Bro plz admend mi worx.. ya.. haha.. Cheers..
God Bless..
Lorenzo...