No not really, there is very little chlorine actually gets through the system to the tap. Lots of well known breeders and fishkeepers never even dechlorinate. I always do as a precaution but there is little point in repeating the same thing which has just failed and because the ammonia seems so stable there doesn't appear to be that much of a bacterial colony present anyway. So its worth the risk.
It has to be something so at this stage I feel it would be wrong to make any assumption. At the beginning I would not have expected there to be a problem with that combination and there may well not be but all things have to be considered in view of what has happened.
I really doubt that this is going to work from this position and I think it would be a waste of time just waiting any longer. If it were me I would make a 100% water change without using prime. Then add a single dose of biomature and test the water for ammonia and see if that one dose is converted to nitrite and then nitrate without adding a second dose.
With that water chemistry there is no reason for this not to have worked. I once read a review where the tester had exactly this situation happen to them. Although Waterlife never reveal what is in their products Biomature is just an ammonia salt and a few other bits to create ideal conditions for a culture to develop. But essentially it is just an ammonia salt.
This is just a thought but did you use Prime to dechlorinate the water when starting this cycle? If so I wonder if it reacted with the biomature to cause this.
I would definitely recommend sticking to the true intertidal species and not those found at the extreme lower shore, that way you will avoid the need of an expensive cooler. The only other thing is to make sure the predatory species are smaller specimens than their prey species I know it sounds obvious but they are horrendous when it comes to trying to eat each other. There is a whole range of small gobies, two spot gobies are a must because they swim mid water unlike most others. Blennies, we have a good few species, pipe fish, sand smelt, some of the smaller wrasse, 15 spined stickleback and a whole range of inverts - squat lobsters, porcelain crabs shrimps and prawns, anemones all live in the intertidal zone.