Anyone had any problems with aggressive cardinals? I had 3 Molly fry (almost 3 months old) in a 30 litre tank with 6 new cardinal tetra first 2 days were fine, went to work came home and there was only 1 Molly Iāve searched the whole tank, removed all plants and decorations temporarily couldnāt find them, dismantled my filter and they hadnāt got stuck in there either, theyāve just vanished into thin air it seems, canāt find any remains or anything