It got to this point with me & both my 55 & 65. My 55 was slowly becoming my favorite tank with a pictus cat, bichir, abk, eel & leopard ctenopoma. The Jack Dempsey that was in my 65 has always been one of my top 2 favorite fish that I keep, but it got to the point where there was no activity in the tank except at feeding time. I had him in there with a shoal of 16 tiger barbs...they were interesting enough but soon got boring between just them and the JD.
I gave away half of the barbs, moved 8 of them over to my 55 along with the jack. Now I'm turning that 65 into SW. So I also took the rocks & half the driftwood and moved it to the 55. THEN I found someone local who gave me a bunch of java moss & water sprite clippings which are now planted & attached to my driftwood. Basically I just spruced up the aquascape a LOT, added the jack dempsey & barbs and have started paying 100% attention to that tank.
Lately I've gone from just doing feedings & water changes and the occasional second glance, to spending more time in front of my tank than I spend anywhere else at home. I'm loving it and its really paying off mentally for me & visually for the other people in the house.
I have a tank full of 'nocturnal predators' that are all completely comfortable all day long all over the tank. The pictus & the JD have their specific territories, the bichirs hang out wherever, the ctenopoma lurks the shadows, the knife is found all over the place like a ninja and the eel has been spending a lot of time in the new plants, especially the floating ones. I also have a juvie convict who I'm waiting to grow large enough to catch & rehome. And I have 4 snails who actually add a lot of personality to the tank as well.
I feel like I've done well at creating a mini-monster tank. A collection of fish each beautiful or stunning in its own way, lucky enough to have specimens with temperaments that allow coexistence in the small space even though some people would think it would never be possible, and a dynamic in the tank that makes for constant activity at the speed of relax.
So basically...redecorate, make a comfortable spot to sit in front of the tank and watch, and see if they're actually being completely lethargic, or if they're leading lives that you're just not witnessing which is causing you to lose interest. What also might help, is to have some guests over who would appreciate sitting and watching an interesting/visually & mentally stimulating aquarium, but don't know enough about fish & keeping them to have lost that bit of magic from it. Make it a conversational centerpiece
