Another fuse question for two Sundown 3000D

[46panel 10+ year member]

I am chaning my setup and switching to these two 3000D. I currently still have my power wire ran with two 200 amp anl fuses on that run from the battery under the hood to the rear bank batteries, 1 fuse near each battery. First question is should I change these 200's to 300's or something else? Another question is should I put 2 more fuses between the rear battery and amps. This run from back battery to amps will only be about 12 inches away each? If so I'd need to get two more fuse holders and fuses, if I need to what size fuses for each?

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[joep1231026 10+ year member]

i have a sundown SAZ-3000D, and i am using a 300A fuse. I may be wrong, but i believe the fuse is used to protect the amp, so if you have one fuse by the first battery which is wired to the second battery, which is wired to the amp, you could easily pull a current larger than the fuse rating to the amp (and blow it). once again i could be wrong, but if anything, i would suggest using one 300A fuse between the amp and the battery that the amp is connected to (a foot or two away from that battery).