just to share my experience...
so i've been feeding my 20" jar whole shrimps with shell on (tail spikes removed of course) and stuffed with sticks, and things have been fine for quite a long while. well recently i bought a large batch of new shrimps for a good price ($3.29/lb!) and after a couple of weeks of feedings, i started noticing PA (protruding anus) on my jar. apparently, this batch of shrimps have harder shells than the ones i usually use which i initially thought would be OK since the jar is quite big now. WRONG!!!
the fish has been put on strict diet for 4 days now and the condition has been improving. so not only spikes but also hard shells could do damages. just make sure shrimps you use don't have hard shells or if so remove them first.
so i've been feeding my 20" jar whole shrimps with shell on (tail spikes removed of course) and stuffed with sticks, and things have been fine for quite a long while. well recently i bought a large batch of new shrimps for a good price ($3.29/lb!) and after a couple of weeks of feedings, i started noticing PA (protruding anus) on my jar. apparently, this batch of shrimps have harder shells than the ones i usually use which i initially thought would be OK since the jar is quite big now. WRONG!!!
the fish has been put on strict diet for 4 days now and the condition has been improving. so not only spikes but also hard shells could do damages. just make sure shrimps you use don't have hard shells or if so remove them first.