I have PLENTY of hair algae, so lack of food isn't a problem. But have noticed over the last few weeks that my astrea population is dwindling. Probably doesn't help that zebra leg hermits are voracious little bastards and very opportunistic when a snail is bottom up. Seems like the snails would rather be on the glass than chowing on my green hair algae ... is there a better species for hair algae removal?