What rocks are good with golden rams?

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Getting a pair of golden rams in my tank, so far only plants, I want white rocks with lots of hiding places ofcourse- ideas?

20gal US tank stats:

^ substrate: 15.4lbs seachem flourite, 15lbs estes white fine gravel
^ lighting: coralife 21" 65watt 6700k
^ filter: whisper 20 with no carbon in the filter pad
^ heater: 50watt heater w/ temp @ 80-81 F
^ co2: hagen Plant Gro Co2 Natural System
^ plant food: micro: bigals liquid food
^ plant food: macro: none at the moment
^ plants:
2 MARBLE VALLISNERIA
1 AMAZON SWORD
1 RUBIN SWORD
6 DWARF CHAIN TENNELLUS
2 RED TEMPLE BUNCH PLANTS
2 MONEYWORT BUNCH PLANTS
1 RUFFLE SWORD
1 ANACHARIS BUNCH PLANT
2 CABOMBA BUNCH PLANT

no water tests yet, my test tools only test: am, nit, nate, ph, kh - do I need any other tests?

thanks