all three of my pbass are acting wierd. their rubbing their side agianst the gravel. any ideas, water permanter is ok, ph 7.6, Nit 0, Amo 0. oh theres some agression between all three, no one has the up end. could that be the cause? how would i stop the agression between them. just remodle the aquascape, and theres plenty of for them to hide.