Ok this used to bother me SOOO much is my pike to big for its tank and is it to overstocked honest answers pleezz i have a 5" oscar three 3" (or less) acara's, the 5" pike and a 3" plec. Usually i have an atman and a aquatech 15 but now i just have a topfin 20 i am supposed to do 1 50% water changes a day but lately i have been very lazy (and busy) so i end up doing about one 90% waterchanges per week. 
But the tank is only temporary so i am more worried about my 5" pike bieng to big for my 30" inch tank. i go by a rule that says a tank 4 (prefurably 6 or more ) times the length of the fish and over twice the length of the fish wide is ok but i am no expert! Thoughts?

But the tank is only temporary so i am more worried about my 5" pike bieng to big for my 30" inch tank. i go by a rule that says a tank 4 (prefurably 6 or more ) times the length of the fish and over twice the length of the fish wide is ok but i am no expert! Thoughts?

