Hello. I've had my 5 gallon bowfront tank for about a month. Its current inhabitant is an african dwarf frog.
The first betta I had in there didn't eat in three days. I came home to find it with its tail caught in the Marina i25 internal filter. The fish died. I returned the filter, and bought a Top Fin 10 Power Filter.
My second betta ate reguarly, and he was a very pretty crowntail. I was happy to see him eating his Omega One flakes. I came home to find this one with its tail caught in the Top Fin 10 Power Filter. The fish died. I returned the Top Fin 10 power filter and bought some activated carbon and aquarium silicone.
I got a piece of 3" PVC pipe and a cap. I really only needed 1½" pipe because the 3" pipe takes up like 3" of the 10" length of the tank, so he doesn't have much room. I put a sponge in, and some activated carbon. I siliconed the cap on, drilled a hole for the airline tubing, and drilled some bubble release holes at the top. So right now, I have a homemade, oversized sponge filter.
I have an Elite single sponge filter coming in the mail. I bought it off Amazon for $6 and it should be a lot smaller than my current filter so my frog has some roaming space.
The frog is mainly in there until I get the sponge filter, and until the nitrogen cycle is complete. I just got my API test kit in the mail today, and tested my water. I had about 2ppm ammonia which is pretty high, so I did about a 10% change right now and I'm doing a 25% change tomorrow. That should bring the ammonia down a bit. My logs for today were:
Wednesday, June 6th, 2012:
Ammonia - 2ppm
Ammonia (after 10% change) - 1.75ppm
Nitrite - 0.15ppm
Nitrate - 0ppm
pH - about 7.4. Should I be concerned? I don't know about pH.