I am an aquarium newbie. We have 2 bettas left one of the males has gone to a better place after we had him for 18 months. We also have some goldfish. We had to take an extended weekend trip and leave the fish. I always feel guilty. I tried an automatic feeder but came back to a gunky mess in the thing. The pet shop staff suggested feeder blocks. I thought ok they should have adequate circulation in the different tanks and I will not have to feel so guilty about leaving them. Well for the 1st time in just over a year my fish all got ick. The bettas had it worse than the goldfish but it was a lot of work to get them all healthy again. NEVER AGAIN for the feeder blocks purchased at Petsmart.
How long was your extended weekend trip? 4 days? Your fish will be fine if left for four days without food if they are full grown. Those feeder blocks are bad in my opinion.
Feeder blocks have caused the demise of my fish only once. The once and ONLY time I ever used them and will never use them again for that matter. They are bad news.