Hello all I just purchaced a 180g tank and am currently housing my 75g brackish fish in it (hand sized red scat, archerfish x2, seabe mono x2, fw eel, spotted puffer, figure 8 puff, and a datnoid) I got the tank half full atm and I'm really liking how it looks. Ok so for the real question lol. What can I use or diy to filter a half full tank this size?? I would really like to do a 55g sump to house all my hob filters but how would I get the water to and from the sump in this situation. Thanks in advance!!!