Wouldn't nitrates/nitrites (not for sure which) build up in the gravel? Wouldn't that kill the fish?
noooooo
detritus would build up in the gravel and cause nitrate levels to rise
but what will kill the fish if the gravel was deep enough is that the grave lbed will become anaerobic and hydrogen sulfide (i think thats the gas) gas will build up in the gravel and that is what will kill the fish
