ok we will only carry the 3.5 tank they sell, plus a new 3.5 tank they are making and a new larger tank they are making, so no more of the old ones in big or small. now that we know the ravens are good and people are liking them i will have a few different tanks just for the ravens that work well with them. a tank with screw is best, it can un screwed to releave pressure and makes filling easier and avoides filling issues.
its more of the syphoning we are trying to prevent. but overall once the fill is proper it should tick along until they are empty
the fill hole with a screw would be perfect!