For some context, I made this tank with aquarium silicone glue and rocks that I found (I made sure they would not alter the PH). It has been running for a little over a month and I added 6 CPDs (celestial pearl danios/galaxy rasboras) last week. One of them had been missing for 3 days, but I assumed I was just counting weird or that he was hiding amongst the moss. Yesterday I finally went looking for him and decided to look behind the tank where I found the poor little guy stuck inches deep under the substrate. I thought for sure he had kicked the bucket but I fished him out and he swam right away!!! Anyway, they keep going behind the rocks and I am worried that more of them will get stuck,,,, what should I do? I love my little CPDs and I don't want any of them to get hurt.
Here are my options:
I could take out all the water and fish, dry out the tank and seal it all in more silicone so there are no holes. Pro: I get to keep them in this setup, Con: Takes a lot of time and if they get stuck again it will be even harder for them to swim out.
I could completely re-do this tank and scrape off the silicone and take out the rocks. Pro: No need to buy anything new, Con: I like the setup
I could get them a new tank and put something bigger in this tank. Pro: Nothing gets changed in the tank, and I can use my old filter so it should cycle fast, Con: Not sure of other suitable fish, I have to make a new tank for CPDs and I am running out of fish tank space.
Anyway, those are all the options I could think of please send ideas/criticism/options my way ASAP!