Hi everyone, I'm new to this forum but not to the hobby. I have a 55 gallon NPT that I set up last month, I didn't read carefully and covered my soil with about 4" of sand, got a huge hydrogen sulfide buildup. I removed most of the sand and poked at the substrate with a chopstick, releasing a lot of bubbles. I did a huge water change and my fish are fine now, all other parameters are normal-- nitrates barely detectable, and pH is 7.2 if that's relevant.
I don't necessarily like the sand and I was going to take it out and replace it but I don't know what to replace it with. I like the idea of leaving a thin layer in there and making little "paths" with smooth river stones, like these: http://18.104.22.168/~gottabem/robbus...picture-11.png
the rocks would cover maybe 1/3 of the substrate alltogether. would that be alright? Any other suggestions for what I should use? I have featherfin synodontis and corys in the tank so anything that won't hurt their barbels.
Plants I have in the tank:
-tiger lotus [just a bulb and roots at the moment]
-also anubias, flame moss and java fern, not in the substrate
-planning to add a banana plant
Thanks very much!