I am 6 months or so new to the hobby. When I bought my fish I had purchase 2 glow sharks a cat fish and 3 Serpea tetra. I also have about 5 guppies! (They breed very quickly so I put some I. My sones take he has all guppies) I have since learned Ine shark for my 55 gallon tank ( not that the pet store told me ) One is huge! For the life of me I can not catch either of them to put In my sons 50 Gallon tank! Will it be ok to leave them both or any tips on how to catch them ? The small one hides a lot and the large one dominates the tank. They seem better when the top light is off and just the bubbler/light bar is on.