Posted 05 October 2015 - 05:42 AM
the gravely sand will work. it wont stay put in a pile like that, but the gravel its self should be fine. the natives you mentioned are fairly flexible.
as mentioned before, i would swap out the flag fish. flag fish can be kinda mean. i would go with blue fin killifish.
"The ecologist is continually having to look at the aspects of nature with which he is unfamiliar and perforce must be an amateur for much of his working time.... professionals may carp at omissions, misconstructions, or even downright errors in these pages. perhaps ultimately they may forgive them for the sake of the overall vision that only the amateur, or the ecologist, blithely sets out to experience."G. Evelyn Hutchinson