those blue and white pebbles look like peanut m&ms
i would take them out... and probably captain america too, but to each his own. personally, i'd remove the pipe ornaments as well, but they seem to work pretty well with the overall look.
the fuzzy tribble-ish thing behind the right pipe- is that a marimo? you might want to take that out, it looks pretty dead. it'll start messing up your water soon. and the marselia on the right corner will probably need co2 to convert to emersed form, if at all. there are some marselia sp which can never be submersed. also, you'll want to get some fertilization if that's just sand. if you've got dirt under it, then never mind.
i would take them out... and probably captain america too, but to each his own. personally, i'd remove the pipe ornaments as well, but they seem to work pretty well with the overall look.
the fuzzy tribble-ish thing behind the right pipe- is that a marimo? you might want to take that out, it looks pretty dead. it'll start messing up your water soon. and the marselia on the right corner will probably need co2 to convert to emersed form, if at all. there are some marselia sp which can never be submersed. also, you'll want to get some fertilization if that's just sand. if you've got dirt under it, then never mind.