Hi everyone was thinking of getting one of these and wanted to know something. I have crushed coral for my substrate so the goby would not be able to disgard it through its gills so to speak like they do. I think the coral would be to large. Can I have one of these and its diet come from supplemental feeding when I feed my other fish? Or do you have to have a sandy substrate? Also, are these fish resilent to ick like most gobies and blennies, b/c for my last fish QT may not be an option on this one.