look I have a bgk they would be fine in the 75 but that is the absolute smallest.
if you do the stock you had ( 1 sen 1 del 1 bgk) then you can decide on a topwater fish and a few midwater. the bgk will stay towards the bottom but they have great personality.if you want preds, you could do a needlenosed gar for topwater and mabey a quicker fish for the midwater a school of tiger barbs would be cool. hopefully they would be quickenough to get away from the bichirs. also make sure you get the bgk first to give it a chance to grow befor you add the more agg. bichirs
remember with this hobby you have tons of options. what are you doing for filtration? that would say what you would be able to keep.?
if you do the stock you had ( 1 sen 1 del 1 bgk) then you can decide on a topwater fish and a few midwater. the bgk will stay towards the bottom but they have great personality.if you want preds, you could do a needlenosed gar for topwater and mabey a quicker fish for the midwater a school of tiger barbs would be cool. hopefully they would be quickenough to get away from the bichirs. also make sure you get the bgk first to give it a chance to grow befor you add the more agg. bichirs
remember with this hobby you have tons of options. what are you doing for filtration? that would say what you would be able to keep.?