▁It ▁will ▁not ▁change ▁to ▁blue , ▁though , ▁but ▁if ▁in ▁a ▁dark ▁substr ate ▁will ▁generally ▁become ▁dark er ▁in ▁color . ▁ ▁Like ▁all ▁members ▁of ▁the ▁genus ▁T etra odon , ▁the ▁Congo ▁p uffer ▁is ▁capable ▁of ▁infl ating ▁itself ▁with ▁water ▁or ▁air ▁when ▁str essed ▁or ▁otherwise ▁fright ened . ▁ ▁In ▁capt ivity , ▁Congo ▁pu ff ers ▁require ▁large ▁t anks ▁with ▁the ▁temperature ▁between ▁ 2 3 ▁and ▁ 2 6   ° C . ▁ ▁They ▁are ▁sensitive ▁to ▁both ▁nit rit es ▁and ▁nit r ates , ▁so ▁over fil tr ation ▁is ▁required . ▁The ▁water ▁p H ▁should ▁be ▁around ▁ 7 . ▁The ▁lif es pan ▁and ▁bre eding ▁hab its ▁of ▁Congo ▁pu ff ers ▁are ▁unknown . ▁ ▁References ▁ ▁Congo ▁p uffer ▁Category : Fa una ▁of ▁Central ▁Africa ▁Congo ▁p uffer <0x0A> </s> ▁N ok ia ▁is ▁a ▁Finn ish ▁tele communic ations ▁corpor ation . ▁ ▁N ok ia ▁may ▁also ▁refer ▁to : ▁ ▁Comp an ies ▁ ▁N ok ia ▁Network s , ▁a ▁subs idi ary ▁of ▁N ok ia ▁Corporation ▁ ▁N ok ian ▁Ty res ▁( ), ▁a ▁Finn ish ▁manufact urer ▁of ▁ty res ▁split ▁from ▁N ok ia ▁Corporation ▁in ▁ 1 9 8 8 ▁ ▁N ok ian ▁Foot we ar ▁( ), ▁a ▁Finn ish ▁manufact urer ▁of ▁foot we ar ▁split ▁from ▁N ok ia ▁Corporation ▁in ▁ 1 9 9 0 ▁