Sorry to hear this...I did fish keeping years ago in my past but I never did it to the level I should have to really enjoy it...fast forward to today and I've gone from a 20 gallon (badly filtered due to ignorance many years ago) to 29 gallons 2 years ago (still filtered bad but not AS bad) to the last 6 months where I transitioned from a 60 gallon to a 150 gallon...both in this instance were done right and I'm in the process of picking out the stock for the 150 gallon as I write this...it takes a lot of effort but if done right is worth every second invested....maybe you just need a different tank setup?